技术领域technical field
本发明涉及对并联连接的多个光源进行控制的光源控制装置和光源控制方法。The present invention relates to a light source control device and a light source control method for controlling a plurality of light sources connected in parallel.
背景技术Background technique
近年来，提出了作为投影型影像显示装置的光源使用电气上并联连接的多个LED(LightEmittingDiode，发光二极管)的集合体。并联连接LED的优点在于，能够以较低的电压驱动较多数量的LED。另外，作为其它优点，在于通过点亮多个LED，能够获得高亮度的光源。因此，使用了由并联连接的多个LED构成的光源的装置与使用了当前的灯光源的装置相比，能够抑制装置整体的消耗电力。In recent years, it has been proposed to use an aggregate of a plurality of LEDs (Light Emitting Diodes, light emitting diodes) electrically connected in parallel as a light source of a projection type image display device. The advantage of connecting LEDs in parallel is that a higher number of LEDs can be driven at a lower voltage. In addition, as another advantage, it is possible to obtain a high-intensity light source by lighting a plurality of LEDs. Therefore, a device using a light source composed of a plurality of LEDs connected in parallel can suppress the power consumption of the entire device compared to a device using a conventional lamp light source.
此外，使用了多个LED的装置需要对各LED的亮度进行控制。在专利文献1和专利文献2中，公开有对多个LED进行控制的技术(下面也称为“关联技术A”)。In addition, a device using a plurality of LEDs needs to control the brightness of each LED. Patent Document 1 and Patent Document 2 disclose a technique for controlling a plurality of LEDs (hereinafter also referred to as "related technique A").
专利文献1：日本特开2007-095391号公报(段落0013-0016、图1)Patent Document 1: Japanese Patent Laid-Open No. 2007-095391 (paragraphs 0013-0016, FIG. 1 )
专利文献2：日本特开2007-096113号公报(段落0018-0019、图1)Patent Document 2: Japanese Patent Application Laid-Open No. 2007-096113 (paragraphs 0018-0019, FIG. 1 )
发明内容Contents of the invention
但是，在使用了由并联连接的多个LED构成的光源部的结构中，存在只要该多个LED中的1个LED发生故障则全部的LED都不点亮的问题。However, in the configuration using a light source unit composed of a plurality of LEDs connected in parallel, there is a problem that if one of the plurality of LEDs fails, all the LEDs are not lit.
例如，在构成光源部的多个LED中的1个LED发生了短路故障的情况下，来自恒流电路的驱动电流集中向该发生短路故障的LED提供。由此，全部的LED都不点亮。For example, when a short-circuit failure occurs in one of the LEDs constituting the light source unit, the drive current from the constant current circuit is concentratedly supplied to the short-circuit failure LED. Accordingly, all the LEDs are not lit.
本发明就是为了解决这样的问题而完成的，其目的在于提供一种即使并联连接的多个光源中的任意一个发生故障，也能够进行光源的持续性发光的光源控制装置等。The present invention was made to solve such problems, and an object of the present invention is to provide a light source control device and the like capable of continuously emitting light from a light source even if any one of a plurality of light sources connected in parallel fails.
为了实现所述目的，本发明的一个方式涉及的光源控制装置对并联连接的、通过被提供电流而发光的多个光源进行控制。所述光源控制装置具有：电流提供部，其向所述多个光源统一提供电流；第1电流检测部，其检测第1电流，该第1电流是所述电流提供部向所述多个光源统一提供的所述电流；第2电流检测部，其检测第2电流，该第2电流是向所述多个光源中的至少1个光源提供的电流；开关部，其具有使向所述多个光源各自的电流的提供停止的功能；以及控制部，其根据所述第1电流和所述第2电流来判定在所述多个光源中是否存在故障光源，所述控制部还在存在所述故障光源的情况下，对所述电流提供部和所述开关部中的至少一方进行控制，使得对正常光源持续地进行电流提供，其中，该正常光源是所述多个光源中的该故障光源以外的光源。In order to achieve the object, a light source control device according to an aspect of the present invention controls a plurality of light sources connected in parallel and emitting light when supplied with an electric current. The light source control device includes: a current supply unit that supplies current to the plurality of light sources collectively; a first current detection unit that detects a first current that the current supply unit supplies to the plurality of light sources. the current supplied uniformly; a second current detection unit that detects a second current that is supplied to at least one light source among the plurality of light sources; a function of stopping the supply of currents for each of the light sources; and a control unit that determines whether there is a faulty light source among the plurality of light sources based on the first current and the second current, and the control unit still has all the light sources. In the case of the faulty light source, at least one of the current supply unit and the switch unit is controlled so as to continuously supply current to a normal light source, wherein the normal light source is the faulty light source among the plurality of light sources. Light sources other than light sources.
本发明还提供一种光源控制装置执行的光源控制方法，该光源控制装置对并联连接的、通过被提供电流而发光的多个光源进行控制。所述光源控制装置具有：电流提供部，其向所述多个光源统一提供电流；第1电流检测部，其检测第1电流，该第1电流是所述电流提供部向所述多个光源统一提供的所述电流；第2电流检测部，其检测第2电流，该第2电流是向所述多个光源中的至少1个光源提供的电流；以及开关部，其具有使向所述多个光源各自的电流提供停止的功能。所述光源控制方法包括：根据所述第1电流和所述第2电流来判定在所述多个光源中是否存在故障光源的步骤；以及在存在所述故障光源的情况下，对所述电流提供部和所述开关部中的至少一方进行控制，使得对正常光源持续地进行电流提供的步骤，其中，该正常光源是所述多个光源中的该故障光源以外的光源。The present invention also provides a light source control method executed by a light source control device that controls a plurality of light sources connected in parallel to emit light by being supplied with current. The light source control device includes: a current supply unit that supplies current to the plurality of light sources collectively; a first current detection unit that detects a first current that the current supply unit supplies to the plurality of light sources. the current supplied collectively; a second current detection unit that detects a second current that is supplied to at least one light source among the plurality of light sources; The individual currents of the plurality of light sources provide the stopping function. The light source control method includes: a step of determining whether there is a faulty light source among the plurality of light sources according to the first current and the second current; At least one of the supply unit and the switch unit controls to continuously supply current to a normal light source, wherein the normal light source is a light source other than the faulty light source among the plurality of light sources.
根据本发明，控制部判定在并联连接的多个光源中是否存在故障光源。所述控制部在存在所述故障光源的情况下，对所述电流提供部和所述开关部中的至少一方进行控制，使得向作为所述多个光源中的该故障光源以外的光源的正常光源持续提供电流。According to the present invention, the control unit determines whether or not there is a faulty light source among the plurality of light sources connected in parallel. When the malfunctioning light source exists, the control unit controls at least one of the current supply unit and the switching unit so as to switch to a normal light source other than the malfunctioning light source among the plurality of light sources. The light source supplies current continuously.
由此，即使并联连接的多个光源中的任意光源发生故障，也能够进行光源的持续发光。Thereby, even if any one of the plurality of light sources connected in parallel fails, the light source can continue to emit light.
附图说明Description of drawings
图1是示出本发明的实施方式1涉及的光源控制装置的结构的框图。FIG. 1 is a block diagram showing the configuration of a light source control device according to Embodiment 1 of the present invention.
图2是示出本发明的实施方式1涉及的光源控制装置的结构的一例的框图。2 is a block diagram showing an example of the configuration of the light source control device according to Embodiment 1 of the present invention.
图3是示出本发明的实施方式1涉及的电流检测部的特性的图。3 is a graph showing characteristics of a current detection unit according to Embodiment 1 of the present invention.
图4是驱动电流管理处理的流程图。FIG. 4 is a flowchart of drive current management processing.
图5是示出比较例涉及的光源控制装置的结构的图。FIG. 5 is a diagram illustrating a configuration of a light source control device according to a comparative example.
标号说明Label description
11、11-1、11-2、11-3、11-4：光源；14、14-1、14-2、14-3、14-4、14-m：开关；15、15-1、15-2、15-3、15-4、15-m：开关控制电路；100、100N：电流提供部；110、110N：光源部；130、131：电流检测部；140：开关部；200：AD转换器；900、900N：控制部；1000、2000：光源控制装置；R0、R1、R1-1、R1-2、R1-3、R1-4、R1-m：检测电阻。11, 11-1, 11-2, 11-3, 11-4: light source; 14, 14-1, 14-2, 14-3, 14-4, 14-m: switch; 15, 15-1, 15-2, 15-3, 15-4, 15-m: switch control circuit; 100, 100N: current supply part; 110, 110N: light source part; 130, 131: current detection part; 140: switch part; 200: AD converter; 900, 900N: control unit; 1000, 2000: light source control device; R0, R1, R1-1, R1-2, R1-3, R1-4, R1-m: detection resistor.
具体实施方式detailed description
下面，参照附图对本发明的实施方式进行说明。在下面的说明中，对相同的结构要素标注相同的标号。它们的名称和功能也相同。因此，有时会省略它们的详细的说明。Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are attached to the same structural elements. Their names and functions are also the same. Therefore, their detailed descriptions are sometimes omitted.
＜比较例＞＜Comparative example＞
下面对作为比较例的光源控制装置进行说明。图5是示出比较例涉及的光源控制装置2000的结构的图。光源控制装置2000是使用了电气上并联连接的多个光源的装置。Next, a light source control device as a comparative example will be described. FIG. 5 is a diagram showing the configuration of a light source control device 2000 according to a comparative example. The light source control device 2000 is a device using a plurality of light sources electrically connected in parallel.
参照图5，光源控制装置2000具有：电流提供部100N、光源部110N以及控制部900N。Referring to FIG. 5 , the light source control device 2000 includes a current supply unit 100N, a light source unit 110N, and a control unit 900N.
光源部110N包括光源11-1、11-2、11-3、11-4。光源11-1、11-2、11-3、11-4电气上并联连接。下面，也将各个光源11-1、11-2、11-3、11-4简称为“光源11”。光源11例如是LED。The light source unit 110N includes light sources 11-1, 11-2, 11-3, and 11-4. The light sources 11-1, 11-2, 11-3, and 11-4 are electrically connected in parallel. Hereinafter, the respective light sources 11-1, 11-2, 11-3, and 11-4 are also simply referred to as "light sources 11". The light source 11 is, for example, an LED.
控制部900N对电流提供部100N进行控制。控制部900N例如是MPU(MicroProcessingUnit，微处理单元)等微机(微型计算机)。电流提供部100N是依照来自控制部900N的控制向光源部110N提供规定的驱动电流If0的恒流电路。即，电流提供部100N向光源11-1、11-2、11-3、11-4提供电流。由此，各个光源11-1、11-2、11-3、11-4发光。The control unit 900N controls the current supply unit 100N. The control unit 900N is, for example, a microcomputer (microcomputer) such as an MPU (MicroProcessing Unit). The current supply unit 100N is a constant current circuit that supplies a predetermined drive current If0 to the light source unit 110N under the control of the control unit 900N. That is, the current supply unit 100N supplies current to the light sources 11-1, 11-2, 11-3, and 11-4. Thereby, each light source 11-1, 11-2, 11-3, 11-4 emits light.
在LED中，射出的光的亮度是根据提供的电流而可变的。光源控制装置2000具有为了获得期望的亮度，用户(使用者)利用用户界面等并借助于控制部900N来设定驱动电流If0的结构。In LEDs, the brightness of emitted light is variable according to the supplied current. The light source control device 2000 has a configuration in which the user (user) sets the driving current If0 through the control unit 900N through a user interface or the like in order to obtain desired brightness.
但是，在光源控制装置2000的结构中，如上所述，存在只要多个光源11中的1个光源11发生故障则全部的光源11都不再点亮的问题。However, in the configuration of the light source control device 2000, as described above, there is a problem that if one of the plurality of light sources 11 fails, all the light sources 11 are not turned on.
例如，在包含于光源部110N的4个光源11中的1个光源11发生了短路故障的情况下，来自电流提供部100N的驱动电流集中向发生了短路故障的光源11提供。由此，全部的光源11都不点亮。For example, when one of the four light sources 11 included in the light source unit 110N is short-circuited, the drive current from the current supply unit 100N is supplied concentratedly to the short-circuited light source 11 . Accordingly, all light sources 11 are not turned on.
另外，假设包含于光源部110N的4个光源11中的1个光源11发生了开路故障。在这种情况下，根据设定的驱动电流If0的电流值，有时会向其它正常的光源11流过超过额定值的电流。在这种情况下，引起更多的故障、最坏情况下全部光源11发生故障的重大问题。In addition, it is assumed that one of the four light sources 11 included in the light source unit 110N has an open failure. In this case, depending on the set current value of the drive current If0, a current exceeding the rated value may flow to other normal light sources 11 . In this case, there arises a serious problem of more failures, and in the worst case, all light sources 11 fail.
因此，在下面的实施方式中解决在上述比较例中说明的上述问题。Therefore, the above-mentioned problems described in the above-mentioned comparative examples are solved in the following embodiments.
＜实施方式1＞<Embodiment 1>
图1是示出本发明的实施方式1涉及的光源控制装置1000的结构的框图。光源控制装置1000例如是作为显示影像的影像显示装置的光源使用的装置。该影像显示装置例如是投影型影像显示装置。该影像显示装置不限于投影型影像显示装置，也可以是其它方式的显示装置。FIG. 1 is a block diagram showing the configuration of a light source control device 1000 according to Embodiment 1 of the present invention. The light source control device 1000 is, for example, a device used as a light source of an image display device that displays images. The image display device is, for example, a projection type image display device. The video display device is not limited to a projection-type video display device, and may be a display device of another type.
如图1所示，光源控制装置1000具有：电流提供部100、光源部110、开关部140、检测电阻R0、检测电阻R1-1～R1-m(m是3以上的自然数)、电流检测部130、131、开关控制电路15-1～15-m(m是3以上的自然数)、AD转换器200、以及控制部900。As shown in FIG. 1 , the light source control device 1000 includes: a current supply unit 100, a light source unit 110, a switch unit 140, a detection resistor R0, detection resistors R1-1 to R1-m (m is a natural number greater than or equal to 3), a current detection unit 130 , 131 , switch control circuits 15 - 1 to 15 - m (m is a natural number equal to or greater than 3), the AD converter 200 , and the control unit 900 .
此外，光源控制装置1000也可以不具有光源部110。即，光源控制装置1000也可以是对外部的光源部110进行控制的结构。In addition, the light source control device 1000 may not have the light source unit 110 . That is, the light source control device 1000 may be configured to control the external light source unit 110 .
控制部900对光源控制装置1000内的各部进行控制。控制部900例如是MPU等微机(微型计算机)。控制部900按照规定的程序执行后述的各种处理。The control unit 900 controls each unit in the light source control device 1000 . The control unit 900 is, for example, a microcomputer (microcomputer) such as an MPU. The control unit 900 executes various types of processing described below in accordance with a predetermined program.
电流提供部100与电线EL1、EL2连接。电线EL1由电线EL1a和电线EL1b构成。电线EL1a和电线EL1b通过检测电阻R0而电连接。电流提供部100是使用电线EL1向光源部110提供规定的驱动电流If0的恒流电路。驱动电流If0是用于使后述的光源发光(点亮)的电流。电流提供部100依照控制部900的控制使驱动电流If0的电流值变化。The current supply unit 100 is connected to the electric wires EL1 and EL2. Electric wire EL1 is comprised from electric wire EL1a and electric wire EL1b. The electric wire EL1a and the electric wire EL1b are electrically connected through the detection resistor R0. The current supply unit 100 is a constant current circuit that supplies a predetermined driving current If0 to the light source unit 110 using the electric wire EL1. The drive current If0 is a current for causing a light source described later to emit light (light up). The current supply unit 100 changes the current value of the drive current If0 in accordance with the control of the control unit 900 .
光源部110包括光源11-1～11-m(m是3以上的自然数)。光源11-1～11-m电气上并联连接。各个光源11-1～11-m是射出规定颜色的光的光源。下面也将各个光源11-1～11-m简称为“光源11”。即，光源部110包括m个光源11。此外，在m＝4的情况下，如图2所示，光源部110包括4个光源11(光源11-1、11-2、11-3、11-4)。另外，在m＝4的情况下，光源11-1、11-2、11-3、11-4电气上并联连接。The light source unit 110 includes light sources 11-1 to 11-m (m is a natural number equal to or greater than 3). The light sources 11-1 to 11-m are electrically connected in parallel. Each of the light sources 11-1 to 11-m is a light source that emits light of a predetermined color. Hereinafter, each of the light sources 11-1 to 11-m will also be simply referred to as "light source 11". That is, the light source unit 110 includes m light sources 11 . Furthermore, when m=4, as shown in FIG. 2 , the light source unit 110 includes four light sources 11 (light sources 11-1, 11-2, 11-3, and 11-4). In addition, when m=4, the light sources 11-1, 11-2, 11-3, and 11-4 are electrically connected in parallel.
光源11是LED。在这种情况下，光源11具有2个端子。另外，光源11通过被提供电流而发光。光源11例如射出红色光。此外，光源11不限于LED，例如也可以是激光器。The light source 11 is an LED. In this case, the light source 11 has two terminals. In addition, the light source 11 emits light by being supplied with electric current. The light source 11 emits red light, for example. In addition, the light source 11 is not limited to an LED, For example, a laser may be sufficient as it.
此外，控制部900控制电流提供部100而对并联连接的光源11-1～11-m的发光进行控制。即，光源控制装置1000对并联连接的多个光源11进行控制。Furthermore, the control unit 900 controls the current supply unit 100 to control the light emission of the parallel-connected light sources 11-1 to 11-m. That is, the light source control device 1000 controls a plurality of light sources 11 connected in parallel.
光源11-1～11-m的一端与电流提供部100电连接。从电流提供部100向光源11-1～11-m整体提供驱动电流If0。换言之，电流提供部100统一向多个光源11提供电流。One ends of the light sources 11 - 1 to 11 - m are electrically connected to the current supply unit 100 . The drive current If0 is supplied from the current supply unit 100 to the entire light sources 11-1 to 11-m. In other words, the current supply unit 100 uniformly supplies current to the plurality of light sources 11 .
电流If1～Ifm分别流向光源11-1～11-m(m是3以上的自然数)。此外，在m＝4的情况下，如图2所示，电流If1、If2、If3、If4分别流向光源11-1、11-2、11-3、11-4。下面也将各个电流If1～Ifm称为“电流Ifn”或者“Ifn”。Currents If1 to Ifm flow to light sources 11-1 to 11-m, respectively (m is a natural number equal to or greater than 3). Moreover, when m=4, as shown in FIG. 2, currents If1, If2, If3, If4 flow to light sources 11-1, 11-2, 11-3, 11-4, respectively. Hereinafter, each of the currents If1 to Ifm is also referred to as "current Ifn" or "Ifn".
各个光源11-1～11-m的规格和特性全部都相同。该规格例如是额定电流。另外，该特性例如是光源11根据提供的电流而发出的光的亮度的特性。另外，该特性例如是当光源11发光时的正向压降(下面也称为“Vf”)。The specifications and characteristics of the respective light sources 11-1 to 11-m are all the same. The specification is, for example, the rated current. In addition, this characteristic is, for example, a characteristic of the luminance of light emitted by the light source 11 according to the supplied current. In addition, the characteristic is, for example, a forward voltage drop (hereinafter also referred to as "Vf") when the light source 11 emits light.
下面也将电压的高电压状态和低电压状态分别称为“高电平”和“低电平”。另外，下面也将高电平和低电平分别称为“H”和“L”。The high voltage state and the low voltage state of the voltage are also referred to as "high level" and "low level" respectively below. In addition, hereinafter, the high level and the low level are also referred to as "H" and "L", respectively.
开关部140具有使向各个多个光源11的电流提供停止的功能。开关部140包括开关14-1～14-m(m是3以上的自然数)。开关14-1～14-m分别与光源11-1～11-m的另一端电连接。The switch unit 140 has a function of stopping the supply of current to each of the plurality of light sources 11 . The switch unit 140 includes switches 14-1 to 14-m (m is a natural number equal to or greater than 3). The switches 14-1 to 14-m are electrically connected to the other ends of the light sources 11-1 to 11-m, respectively.
此外，在m＝4的情况下，如图2所示，开关部140包括4个开关14(开关14-1、14-2、14-3、14-4)。另外，在m＝4的情况下，开关14-1、14-2、14-3、14-4分别与光源11-1、11-2、11-3、11-4的另一端电连接。Moreover, when m=4, as shown in FIG. 2, the switch part 140 includes the four switches 14 (switches 14-1, 14-2, 14-3, 14-4). In addition, when m=4, the switches 14-1, 14-2, 14-3, and 14-4 are electrically connected to the other ends of the light sources 11-1, 11-2, 11-3, and 11-4, respectively.
下面也将各个开关14-1～14-m简称为“开关14”。开关14通过来自外部的控制而成为导通状态(接通状态)和非导通状态(断开状态)的任意一种状态。关于开关14，后面会详细说明，例如在光源11发生短路故障的情况下被控制。开关14例如是FET(Field-EffectTransistor：场效应晶体管)。各个开关14-1～14-m具有相同规格和相同特性。此外，开关14不限于FET，也可以是能够选择性地切换成接通状态和断开状态的任意一种情况的其它的半导体元件。Hereinafter, the respective switches 14-1 to 14-m are also simply referred to as "switches 14". The switch 14 is in any one of a conductive state (on state) and a non-conductive state (off state) under external control. The switch 14 will be described in detail later, and is controlled, for example, when a short-circuit failure occurs in the light source 11 . The switch 14 is, for example, a FET (Field-Effect Transistor: Field-Effect Transistor). The respective switches 14-1 to 14-m have the same specifications and the same characteristics. In addition, the switch 14 is not limited to an FET, and may be another semiconductor element that can be selectively switched between an on state and an off state.
关于开关14-1～14-m，后面会详细说明，它们分别接收控制信号S1～Sm。下面也将各个控制信号S1～Sm简称为“控制信号Sn(n是自然数)”。各开关14在接收到的控制信号S的电平是高电平的情况下成为接通状态(下面也称为“接通”)。另外，各开关14在接收到的控制信号S的电平是低电平的情况下成为断开状态(下面也称为“断开”)。The switches 14-1 to 14-m will be described in detail later, and they receive control signals S1 to Sm, respectively. Hereinafter, each of the control signals S1 to Sm will also be simply referred to as "control signal Sn (n is a natural number)". Each switch 14 is turned on (hereinafter also referred to as "on") when the level of the received control signal S is high. In addition, each switch 14 is in an OFF state (hereinafter also referred to as "OFF") when the level of the received control signal S is low.
检测电阻R0是用于检测电流提供部100所提供的驱动电流If0的电阻。检测电阻R0的一端与电线EL1a连接。检测电阻R0的另一端与电线EL1b连接。The detection resistor R0 is a resistor for detecting the driving current If0 supplied from the current supply unit 100 . One end of the detection resistor R0 is connected to the electric wire EL1a. The other end of the detection resistor R0 is connected to the electric wire EL1b.
检测电阻R1-1～R1-m的一端分别与开关14-1～14-m电连接。另外，检测电阻R1-1～R1-m的另一端与电线EL2连接。One ends of the detection resistors R1-1 to R1-m are electrically connected to the switches 14-1 to 14-m, respectively. In addition, the other ends of the detection resistors R1-1 to R1-m are connected to the electric wire EL2.
此外，在m＝4的情况下，如图2所示，检测电阻R1-1、R1-2、R1-3、R1-4的一端分别与开关14-1、14-2、14-3、14-4电连接。另外，检测电阻R1-1、R1-2、R1-3、R1-4的另一端与电线EL2连接。In addition, in the case of m=4, as shown in FIG. 14-4 electrical connections. In addition, the other ends of detection resistors R1-1, R1-2, R1-3, and R1-4 are connected to electric wire EL2.
检测电阻R1-1是用于检测经由该检测电阻R1-1和开关14-1向电连接的光源11-1提供的电流的电阻。下面也将各个检测电阻R1-1～R1-m简称为“检测电阻R1”。各检测电阻R1是用于检测经由该检测电阻R1、和开关14向电连接的光源11提供的电流的电阻。The detection resistor R1-1 is a resistor for detecting a current supplied to the electrically connected light source 11-1 via the detection resistor R1-1 and the switch 14-1. Hereinafter, each of the detection resistors R1 - 1 to R1 - m will also be referred to as "detection resistor R1" for short. Each detection resistor R1 is a resistor for detecting a current supplied to the electrically connected light source 11 via the detection resistor R1 and the switch 14 .
各个检测电阻R1-1～R1-m具有相同规格和相同特性。例如，各个检测电阻R1-1～R1-m的电阻值相同。即，各个检测电阻R1-2～R1-m是用于流向光源11-2～11-m与流向光源11-1的电流的电流值相同电流值的电流的电阻。例如，在m＝4的情况下，流向光源11-1的电流的电流值、和流向各个光源11-2、11-3、11-4的电流值相同。The detection resistors R1-1 to R1-m have the same specifications and characteristics. For example, the resistance values of the detection resistors R1-1 to R1-m are the same. That is, each of the detection resistors R1-2 to R1-m is a resistor for a current that flows to the light sources 11-2 to 11-m and has the same current value as that of the current flowing to the light source 11-1. For example, when m=4, the current value of the current flowing to the light source 11-1 is the same as the current value flowing to the respective light sources 11-2, 11-3, and 11-4.
电流检测部130对电流提供部100向多个光源11(光源11-1～11-m)统一提供的驱动电流If0进行检测。即，电流检测部130是具有对电流进行检测的功能的电流检测电路。具体地说，电流检测部130向AD转换器200发送电流检测信号VD0，该电流检测信号VD0表示与流向检测电阻R0的电流(驱动电流If0)的电流值对应的电压水平。The current detection unit 130 detects the drive current If0 collectively supplied by the current supply unit 100 to the plurality of light sources 11 (light sources 11-1 to 11-m). That is, the current detection unit 130 is a current detection circuit having a function of detecting a current. Specifically, the current detection unit 130 transmits to the AD converter 200 a current detection signal VD0 indicating a voltage level corresponding to the current value of the current (drive current If0 ) flowing to the detection resistor R0 .
此外，后面会详细说明，电流检测部130根据与检测出的电流对应的后述的数字数据来判定实际上是否向光源部110提供了控制部900对电流提供部100设定的电流值的电流。In addition, as will be described in detail later, the current detection unit 130 determines whether or not a current having a current value set by the control unit 900 to the current supply unit 100 is actually supplied to the light source unit 110 based on digital data described later corresponding to the detected current. .
电流检测部131是故障检测用检测部。电流检测部131对向多个光源11中的1个光源11提供的电流进行检测。具体地说，电流检测部131检测向光源11-1提供的电流。即，电流检测部131是具有对电流进行检测的功能的电流检测电路。电流检测部131的一端与检测电阻R1-1的一端电气上并联连接。另外，电流检测部131的另一端与电线EL2连接。The current detection unit 131 is a detection unit for failure detection. The current detection unit 131 detects the current supplied to one light source 11 among the plurality of light sources 11 . Specifically, the current detection unit 131 detects the current supplied to the light source 11-1. That is, the current detection unit 131 is a current detection circuit having a function of detecting a current. One end of the current detection unit 131 is electrically connected in parallel to one end of the detection resistor R1-1. In addition, the other end of the current detection unit 131 is connected to the electric wire EL2.
更具体地说，电流检测部131向AD转换器200发送电流检测信号VD1，该电流检测信号VD1表示与流向检测电阻R1-1的电流的电流值对应的电压水平。下面，也将各个电流检测信号VD0、VD1称为“电流检测信号VDn”或者“VDn”。另外，下面也将各个电流检测部130、131称为“电流检测部DT”。在本实施方式中，光源控制装置1000所具有的电流检测部DT的数量比光源控制装置1000所具有的光源11的数量少。例如，在光源控制装置1000所具有的电流检测部DT的数量是2个的情况下，光源控制装置1000所具有的光源11的数量是3个以上。More specifically, the current detection unit 131 transmits to the AD converter 200 a current detection signal VD1 indicating a voltage level corresponding to the current value of the current flowing to the detection resistor R1-1. Hereinafter, the respective current detection signals VD0 and VD1 are also referred to as “current detection signal VDn” or “VDn”. In addition, each current detection part 130,131 is also called "current detection part DT" below. In the present embodiment, the number of current detection units DT included in the light source control device 1000 is smaller than the number of light sources 11 included in the light source control device 1000 . For example, when the number of current detection units DT included in the light source control device 1000 is two, the number of light sources 11 included in the light source control device 1000 is three or more.
开关控制电路15-1～15-m分别输出控制信号S1～Sm。开关控制电路15-1～15-m分别与开关14-1～14-m电连接。另外，开关控制电路15-1～15-m通过信号线40与控制部900连接。信号线40例如是IIC总线。The switch control circuits 15-1 to 15-m output control signals S1 to Sm, respectively. The switch control circuits 15-1 to 15-m are electrically connected to the switches 14-1 to 14-m, respectively. In addition, the switch control circuits 15 - 1 to 15 - m are connected to the control unit 900 through the signal line 40 . The signal line 40 is, for example, an IIC bus.
此外，在m＝4的情况下，如图2所示，开关控制电路15-1、15-2、15-3、15-4分别与开关14-1、14-2、14-3、14-4电连接。另外，开关控制电路15-1、15-2、15-3、15-4通过信号线40与控制部900连接。In addition, in the case of m=4, as shown in FIG. -4 electrical connections. In addition, the switch control circuits 15 - 1 , 15 - 2 , 15 - 3 , and 15 - 4 are connected to the control unit 900 through the signal line 40 .
下面也将各个开关控制电路15-1～15-m简称为“开关控制电路15”。各开关控制电路15根据来自控制部900的命令(指示)进行工作。Hereinafter, each of the switch control circuits 15-1 to 15-m will also be simply referred to as "switch control circuit 15". Each switch control circuit 15 operates according to a command (instruction) from the control unit 900 .
各开关控制电路15进行使与该开关控制电路15对应的开关14接通或者断开的控制。具体地说，各开关控制电路15向对应的开关14的栅极(gate)端子发送高电平或者低电平的控制信号Sn。控制信号Sn是用于控制开关14的接通/断开的信号。Each switch control circuit 15 controls to turn on or off the switch 14 corresponding to the switch control circuit 15 . Specifically, each switch control circuit 15 sends a high-level or low-level control signal Sn to a gate terminal of the corresponding switch 14 . The control signal Sn is a signal for controlling ON/OFF of the switch 14 .
例如，在接通开关14-1的情况下，开关控制电路15-1向开关14-1的栅极端子发送高电平的控制信号S1。另外，例如，在断开开关14-1的情况下，开关控制电路15-1向开关14-1的栅极端子发送低电平的控制信号S1。For example, when the switch 14-1 is turned on, the switch control circuit 15-1 sends a high-level control signal S1 to the gate terminal of the switch 14-1. Also, for example, when the switch 14-1 is turned off, the switch control circuit 15-1 sends a low-level control signal S1 to the gate terminal of the switch 14-1.
后面会详细说明，AD转换器200根据规定的规则将电流检测信号VDn的电压值(电压水平)转换成数字数据(数字值)。AD转换器200通过信号线40与控制部900连接。AD转换器200依照来自控制部900的请求，向控制部900发送该数字数据。As will be described in detail later, the AD converter 200 converts the voltage value (voltage level) of the current detection signal VDn into digital data (digital value) according to a predetermined rule. AD converter 200 is connected to control unit 900 via signal line 40 . The AD converter 200 transmits the digital data to the control unit 900 in accordance with a request from the control unit 900 .
接着，作为一例，对m＝4情况下的电流提供部100提供的电流进行详细说明。参照图2，如上所述，电流If1、If2、If3、If4分别流向光源11-1、11-2、11-3、11-4。关于驱动电流If0和电流If1～If4，下面的式1和式2所示的关系成立。Next, as an example, the current supplied by the current supply unit 100 in the case of m=4 will be described in detail. Referring to FIG. 2, as described above, currents If1, If2, If3, If4 flow to light sources 11-1, 11-2, 11-3, 11-4, respectively. Regarding the driving current If0 and the currents If1 to If4, the relationships shown in the following Expressions 1 and 2 are established.
If0＝If1+If2+If3+If4……(式1)If0=If1+If2+If3+If4...(Formula 1)
If1＝If2＝If3＝If4……(式2)If1=If2=If3=If4...(Formula 2)
假设电流提供部100提供的驱动电流If0的电流值例如是12(A)(安培)。在这种情况下，根据式2，If1＝If2＝If3＝If4＝3(A)，当各个开关14-1～14-4接通时，向各个光源11-1～11-4流过3(A)的电流。Assume that the current value of the drive current If0 supplied by the current supply unit 100 is, for example, 12 (A) (ampere). In this case, according to Formula 2, If1=If2=If3=If4=3 (A), when each switch 14-1~14-4 is turned on, 3 (A) current.
接着，对电流检测部130、131进行详细说明。电流检测部130具有根据基于下面的式3的特性将流向检测电阻R0的电流(驱动电流If0)转换成0～5(V)的电流检测信号VD0的功能。另外，电流检测部131具有根据基于下面的式3的特性将流向检测电阻R1-1的电流If1转换成0～5(V)的电流检测信号VD1的功能。如上所述，各个电流检测信号VD0、VD1表现为“电流检测信号VDn”或者“VDn”。另外，如上所述，各个电流If1、If2表现为“电流Ifn”或者“Ifn”。电流检测信号VDn(n：0、1)根据下面的式3计算出。Next, the current detection units 130 and 131 will be described in detail. The current detection unit 130 has a function of converting the current (drive current If0) flowing to the detection resistor R0 into a current detection signal VD0 of 0 to 5 (V) according to the characteristic based on the following Expression 3. In addition, the current detection unit 131 has a function of converting the current If1 flowing to the detection resistor R1-1 into a current detection signal VD1 of 0 to 5 (V) according to the characteristic based on the following Expression 3. As described above, the respective current detection signals VD0 and VD1 appear as "current detection signal VDn" or "VDn". In addition, as described above, the respective currents If1 and If2 appear as "current Ifn" or "Ifn". The current detection signal VDn (n: 0, 1) is calculated according to Equation 3 below.
VDn＝Ifn/5……(式3)VDn=Ifn/5...(Formula 3)
式3的VDn和Ifn中的n是0或者1。n in VDn and Ifn of Formula 3 is 0 or 1.
图3是示出表示式3的特性的特性线L1的图。即，图3是示出本发明的实施方式1的电流检测部DT(电流检测部130、131)的特性的图。FIG. 3 is a graph showing a characteristic line L1 representing the characteristic of Expression 3. FIG. That is, FIG. 3 is a graph showing the characteristics of the current detection unit DT (the current detection units 130 and 131 ) according to Embodiment 1 of the present invention.
电流检测部130、131向AD转换器200发送的电流检测信号VDn的电压根据式3成为下面这样。例如，在电流检测部130、131检测出的电流的电流值是0(A)的情况下，电流检测信号VDn的电压是0(V)。另外，例如，在电流检测部130、131检测出的电流的电流值是2(A)的情况下，电流检测信号VDn的电压是0.4(V)。另外，例如，在电流检测部130、131检测出的电流的电流值是10(A)的情况下，电流检测信号VDn的电压是2.0(V)。The voltage of the current detection signal VDn sent from the current detection units 130 and 131 to the AD converter 200 is as follows according to Equation 3. For example, when the current value of the current detected by the current detection units 130 and 131 is 0 (A), the voltage of the current detection signal VDn is 0 (V). Also, for example, when the current value of the current detected by the current detection units 130 and 131 is 2 (A), the voltage of the current detection signal VDn is 0.4 (V). Also, for example, when the current value of the current detected by the current detection units 130 and 131 is 10 (A), the voltage of the current detection signal VDn is 2.0 (V).
接着，对AD转换器200进行详细说明。AD转换器200包括作为通道的转换部20-0和20-1。转换部20-0、20-1分别与电流检测部130、131连接。Next, the AD converter 200 will be described in detail. The AD converter 200 includes conversion sections 20-0 and 20-1 as channels. The conversion units 20-0, 20-1 are connected to the current detection units 130, 131, respectively.
转换部20-0从电流检测部130接收电流检测信号VD0。转换部20-1从电流检测部131接收电流检测信号VD1。The conversion unit 20 - 0 receives the current detection signal VD0 from the current detection unit 130 . Conversion unit 20 - 1 receives current detection signal VD1 from current detection unit 131 .
转换部20-0将接收到的电流检测信号VD0转换成数字数据DD0。下面，也将数字数据DD0简称为“DD0”。另外，转换部20-1将接收到的电流检测信号VD1转换成数字数据DD1。下面，也将数字数据DD1简称为“DD1”。另外，下面也将各个数字数据DD0、DD1称为“数字数据DDn”或者“DDn”。另外，下面也将各个转换部20-0、20-1称为“转换部20”。The conversion unit 20-0 converts the received current detection signal VD0 into digital data DD0. Hereinafter, the digital data DD0 is also simply referred to as "DD0". In addition, the conversion unit 20-1 converts the received current detection signal VD1 into digital data DD1. Hereinafter, the digital data DD1 is also simply referred to as "DD1". In addition, the respective digital data DD0 and DD1 are also referred to as "digital data DDn" or "DDn" below. In addition, below, each conversion part 20-0, 20-1 is also called "the conversion part 20."
具体地说，各转换部20根据下面的式4将电流检测信号VDn的电压水平转换成数字数据DDn(n：0、1)。数字数据DDn例如是表示从0到250的范围内的任意值的数据。Specifically, each conversion section 20 converts the voltage level of the current detection signal VDn into digital data DDn (n: 0, 1) according to Equation 4 below. The digital data DDn is data representing an arbitrary value within a range from 0 to 250, for example.
DDn＝250×(VDn/5)……(式4)DDn＝250×(VDn/5)...(Formula 4)
式4的DDn和VDn中的n是0或者1。此外，根据式3和式4，下面的式5成立。n in DDn and VDn in Formula 4 is 0 or 1. Furthermore, from Equation 3 and Equation 4, Equation 5 below holds true.
DDn＝Ifn×10……(式5)DDn=Ifn×10...(Formula 5)
式5的DDn和Ifn中的n是0或者1。n in DDn and Ifn in Formula 5 is 0 or 1.
AD转换器200依照来自控制部900的请求，向控制部900发送数字数据DDn。AD converter 200 sends digital data DDn to control unit 900 in accordance with a request from control unit 900 .
此外，对于数字数据DD0、DD1，根据式1、式2和式5的关系，下面的式6的关系成立。Also, for the digital data DD0 and DD1 , from the relationship of Expression 1, Expression 2, and Expression 5, the relationship of Expression 6 below holds true.
DD0＝DD1×4……(式6)DD0＝DD1×4...(Formula 6)
对于DD0、DD1来说，在式6的关系成立的情况下，光源控制装置1000(光源部110)的各光源11未发生故障且光源部110的各光源11正常地工作。另一方面，对于DD0、DD1来说，在式6的关系不成立的情况下，光源11-1～11-4的任意光源发生了故障。For DD0 and DD1, when the relationship of Expression 6 holds, the light sources 11 of the light source control device 1000 (light source unit 110 ) do not fail and the light sources 11 of the light source unit 110 operate normally. On the other hand, for DD0 and DD1, when the relationship of Expression 6 does not hold, any of the light sources 11-1 to 11-4 has failed.
接着，对光源控制装置1000的实际的工作进行说明。首先，控制部900对电流提供部100进行该电流提供部100提供的驱动电流If0的电流值的设定。之后，控制部900对开关控制电路15-1～15-4进行控制，以将开关控制电路15-1～15-4分别发送的控制信号S1～S4的电平设定成高电平。这样，控制部900对开关控制电路15-1～15-4进行控制，使得分别对光源11-1～11-4提供电流If1～If4。由此，控制部900以使用者要求的亮度使各光源11点亮。影像显示装置利用光源控制装置1000发出的光显示影像。Next, the actual operation of the light source control device 1000 will be described. First, the control unit 900 sets the current value of the drive current If0 supplied by the current supply unit 100 to the current supply unit 100 . Thereafter, the control unit 900 controls the switch control circuits 15-1 to 15-4 so as to set the levels of the control signals S1 to S4 respectively transmitted from the switch control circuits 15-1 to 15-4 to high levels. In this way, the control unit 900 controls the switch control circuits 15-1 to 15-4 so as to supply the currents If1 to If4 to the light sources 11-1 to 11-4, respectively. Accordingly, the control unit 900 turns on each light source 11 with the brightness requested by the user. The image display device uses the light emitted by the light source control device 1000 to display images.
另外，控制部900还以规定的间隔经由信号线40从AD转换器200取得(观测)数字数据DD0、DD1。由此，控制部900随时测量(计算出)电流提供部100提供的驱动电流If0、和流向光源11-1的电流If1。In addition, the control unit 900 acquires (observes) digital data DD0 and DD1 from the AD converter 200 via the signal line 40 at predetermined intervals. Thus, the control unit 900 measures (calculates) the driving current If0 supplied from the current supply unit 100 and the current If1 flowing to the light source 11-1 at any time.
下面，也将基于数字数据DD0的值的实际的驱动电流If0的电流值称为“实际电流值”。另外，下面，也将控制部900设定的驱动电流If0的电流值称为“设定电流值”。Hereinafter, the current value of the actual drive current If0 based on the value of the digital data DD0 is also referred to as an "actual current value". In addition, hereinafter, the current value of the drive current If0 set by the control unit 900 is also referred to as a "set current value".
另外，控制部900监视所取得的基于数字数据DD0的值的实际电流值是否与设定电流值相等。下面，也将实际电流值与设定电流值相等的状况称为“状况N”。另外，下面，也将实际电流值与设定电流值不同的状况称为“状况X”。In addition, the control unit 900 monitors whether the acquired actual current value based on the value of the digital data DD0 is equal to the set current value. Hereinafter, the situation where the actual current value is equal to the set current value is also referred to as "state N". In addition, below, the situation in which the actual current value differs from a set current value is also called "situation X".
此外，控制部900构成为：例如，在由于构成电流提供部100的部件的特性偏差等而发生实际电流值与设定电流值不同的状况X的情况下，为了使实际电流值达到期望的电流值而进行用于变更设定电流值的处理N。具体地说，控制部900按照用于进行该处理N的程序进行工作。In addition, the control unit 900 is configured such that, for example, when a situation X occurs in which the actual current value differs from the set current value due to characteristic deviations of components constituting the current supply unit 100, etc., the actual current value becomes a desired current value. value to perform processing N for changing the set current value. Specifically, the control unit 900 operates according to a program for performing the process N.
在此，对下面的前提A1下的光源控制装置1000的工作进行说明。在前提A1中，光源控制装置1000的结构是图2所示的结构。即，在前提A1中，光源部110包括光源11-1、11-2、11-3、11-4。另外，在前提A1中，各个光源11-1～11-4的额定电流是4.5(A)(安培)。下面，也将光源11的额定电流称为“额定值”。Here, the operation of the light source control device 1000 under the following premise A1 will be described. In Premise A1, the light source control device 1000 has the structure shown in FIG. 2 . That is, in Premise A1, the light source unit 110 includes the light sources 11-1, 11-2, 11-3, and 11-4. In addition, in the premise A1, the rated current of each of the light sources 11-1 to 11-4 is 4.5 (A) (ampere). Hereinafter, the rated current of the light source 11 is also referred to as "rated value".
在本说明书中，光源11的额定值(额定电流)是在向该光源11流过该额定值以下的电流值的电流的情况下，该光源11正常工作(发光)的值。另外，光源11的额定值(额定电流)是在向该光源11流过比该额定值大的电流值的电流的情况下，该光源11有可能发生故障的值。In this specification, the rated value (rated current) of the light source 11 is a value at which the light source 11 normally operates (emits light) when a current of a current value lower than the rated value flows through the light source 11 . Note that the rated value (rated current) of the light source 11 is a value at which the light source 11 may malfunction when a current larger than the rated value flows through the light source 11 .
另外，在前提A1中，控制部900控制电流提供部100，将驱动电流If0的电流值设定成12(A)。即，在前提A1中，设定电流值是12(A)。因此，在前提A1中，向各个光源11-1～11-4提供基于式1、式2的12÷4的式子而得到的3(A)的电流Ifn。In addition, in the premise A1, the control unit 900 controls the current supply unit 100 to set the current value of the drive current If0 to 12 (A). That is, in the premise A1, the set current value is 12 (A). Therefore, in Premise A1, a current Ifn of 3(A) obtained based on the expression 12÷4 of Expression 1 and Expression 2 is supplied to each of the light sources 11-1 to 11-4.
在此，假设构成例如电流提供部100的部件没有特性偏差等而维持状况N。此外，通过向式5代入前提A1中的值(Ifn＝3)，而得出DD1＝10×3＝30。然后，通过向式6代入DD1＝30，而得出120作为数字数据DD0的值。即，在状况N下，控制部900取得的数字数据DD0的值是120。Here, it is assumed that, for example, there is no variation in characteristics of members constituting the current supply unit 100 and the state N is maintained. In addition, by substituting the value in the premise A1 (Ifn=3) into Equation 5, DD1=10×3=30 is obtained. Then, by substituting DD1=30 into Equation 6, 120 is obtained as the value of the digital data DD0. That is, in the situation N, the value of the digital data DD0 acquired by the control unit 900 is 120.
下面也将在前提A1中数字数据DD0的值比120大的状况称为“电流过剩状况”。电流过剩状况是驱动电流If0的电流值比12(A)大的状况。另外，下面也将在前提A1中数字数据DD0的值比120小的状况称为“电流不足状况”。电流不足状况是驱动电流If0的电流值比12(A)小的状况。另外，下面也将是光源部110发出的光的亮度、且是使用者期望的亮度称为“目标亮度”。Hereinafter, the situation in which the value of the digital data DD0 is greater than 120 in the premise A1 is also referred to as an "excessive current situation". The excess current state is a state in which the current value of the drive current If0 is larger than 12 (A). In addition, the situation where the value of the digital data DD0 is smaller than 120 in the premise A1 will also be referred to as an "insufficient current situation" below. The insufficient current state is a state in which the current value of the drive current If0 is smaller than 12 (A). In addition, below, the luminance of the light emitted by the light source unit 110 and the luminance desired by the user will also be referred to as "target luminance".
首先，对电流过剩状况的一例进行说明。在此，假设控制部900取得的数字数据DD0的值是130。在这种情况下，控制部900根据式5判断为驱动电流If0的电流值(实际电流值)是13(A)。然后，控制部900控制电流提供部100，使当前的设定电流值比该设定电流值小，以使得实际电流值达到12(A)(即，使DD0达到120)。First, an example of an excess current situation will be described. Here, it is assumed that the value of the digital data DD0 acquired by the control unit 900 is 130. In this case, the control unit 900 determines from Equation 5 that the current value (actual current value) of the drive current If0 is 13 (A). Then, the control unit 900 controls the current supply unit 100 so that the current set current value is smaller than the set current value so that the actual current value reaches 12(A) (that is, DD0 becomes 120).
接着，对电流不足状况的一例进行说明。在此，假设控制部900取得的数字数据DD0的值是110。在这种情况下，控制部900根据式5判断为驱动电流If0的电流值(实际电流值)是11(A)。然后，控制部900控制电流提供部100，使当前的设定电流值比该设定电流值大，以使得实际电流值达到12(A)(即，使DD0达到120)。Next, an example of the current shortage situation will be described. Here, it is assumed that the value of the digital data DD0 acquired by the control unit 900 is 110. In this case, the control unit 900 determines from Equation 5 that the current value (actual current value) of the drive current If0 is 11 (A). Then, the control unit 900 controls the current supply unit 100 so that the current set current value is larger than the set current value so that the actual current value reaches 12 (A) (that is, DD0 becomes 120).
如上所述，控制部900为了获得使用者期望的目标亮度而控制电流提供部100，从而控制向光源部110(光源11)提供的电流的提供量。As described above, the control unit 900 controls the current supply unit 100 to obtain the target luminance desired by the user, thereby controlling the amount of current supplied to the light source unit 110 (light source 11 ).
另外，控制部900进行包含于光源部110中的各光源11是否正常地工作的监视。具体地说，控制部900根据数字数据DD0、DD1的值来判断光源部110的各光源11是否处于正常的状态。In addition, the control unit 900 monitors whether each light source 11 included in the light source unit 110 is operating normally. Specifically, the control unit 900 judges whether each light source 11 of the light source unit 110 is in a normal state based on the values of the digital data DD0 and DD1 .
在前提A1中，在包含于光源部110的全部的光源11正常地工作的情况下，驱动电流If0的电流值是12(A)，所有的If1、If2、If3、If4的电流值是3(A)。下面，也将在前提A1中If1、If2、If3、If4的电流值是3(A)的状态称为“状态STa1”。In premise A1, when all the light sources 11 included in the light source unit 110 operate normally, the current value of the drive current If0 is 12 (A), and the current values of all If1, If2, If3, and If4 are 3 (A). A). Hereinafter, the state in which the current values of If1, If2, If3, and If4 are 3 (A) in the premise A1 is also referred to as "state STa1".
在这种情况下，根据式5，控制部900从AD转换器200取得的数字数据DD0、DD1分别示出120、30。即，对于DD0、DD1来说，在式6的关系成立的情况下，控制部900判断为光源控制装置1000(光源部110)的各光源11正常地工作。在这种情况下，控制部900仍旧使光源部110的各光源11作为用于显示影像的光源而持续点亮。In this case, from Equation 5, the digital data DD0 and DD1 acquired by the control unit 900 from the AD converter 200 represent 120 and 30, respectively. That is, for DD0 and DD1 , when the relationship of Expression 6 holds, the control unit 900 determines that each light source 11 of the light source control device 1000 (light source unit 110 ) is operating normally. In this case, the control unit 900 continues to turn on each light source 11 of the light source unit 110 as a light source for displaying an image.
此外，在光源11的偶发性的故障方式中存在短路故障和开路故障。首先对光源11发生了短路故障的情况进行说明。短路故障是光源11所具有的2个端子发生了短路的故障。开路故障是光源11所具有的2个端子成为开路状态的故障。In addition, there are short-circuit failures and open-circuit failures as sporadic failure modes of the light source 11 . First, a case where a short-circuit fault occurs in the light source 11 will be described. The short-circuit failure is a failure in which two terminals of the light source 11 are short-circuited. An open failure is a failure in which two terminals of the light source 11 are in an open state.
下面，也将包含于光源部110的发生了故障的不能发光的光源11称为“故障光源”。故障光源是发生了短路故障的光源11或者发生了开路故障的光源11。下面，也将发生了短路故障的光源11称“短路故障光源”。另外，下面，也将发生了开路故障的光源11称为“开路故障光源”。另外，下面，也将包含于光源部110的未发生故障且能够正常地发光的光源11称为“正常光源”。正常光源是包含于光源部110的多个光源11中的故障光源以外的光源。Hereinafter, the malfunctioning light source 11 included in the light source unit 110 and unable to emit light is also referred to as a "failure light source". The faulty light source is the light source 11 that has a short-circuit fault or the light source 11 that has an open-circuit fault. Hereinafter, the light source 11 having a short-circuit fault is also referred to as a "short-circuit fault light source". In addition, hereinafter, the light source 11 in which an open failure has occurred is also referred to as an "open failure light source". In addition, below, the light source 11 included in the light source unit 110 that has not failed and can normally emit light is also referred to as a “normal light source”. The normal light source is a light source other than the faulty light source among the plurality of light sources 11 included in the light source unit 110 .
另外，下面，也将用于流过使光源11发光的电流的路径称为“电流路径”。例如，光源11-1的电流路径是用于流过使光源11-1发光的电流的路径。例如，光源11-1的电流路径在图1中是从光源11-1到电线EL2的路径。In addition, below, the path for flowing the electric current which makes the light source 11 emit light is also called a "current path." For example, the current path of the light source 11-1 is a path for flowing a current that causes the light source 11-1 to emit light. For example, the current path of the light source 11-1 is the path from the light source 11-1 to the electric wire EL2 in FIG. 1 .
下面，也将用于确定短路故障光源而受到控制的开关14称为“短路故障判定开关”。例如，前提A1中的短路故障判定开关是开关14-1～14-4。另外，下面也将设置于短路故障光源的电流路径上的开关14称为“短路故障确定开关”。另外，下面也将包含于开关部140的开关14-1～14-m中的短路故障确定开关以外的开关维持接通的状况称为“部分接通状况”。短路故障确定开关是在部分接通状况下仅该短路故障确定开关被断开时使DD1的值变化的开关。Hereinafter, the switch 14 controlled to determine the short-circuit failure light source is also referred to as a "short-circuit failure determination switch". For example, the short-circuit fault determination switches in the premise A1 are the switches 14-1 to 14-4. In addition, the switch 14 provided on the current path of the short-circuit fault light source will also be referred to as a "short-circuit fault determination switch" below. In addition, below, the state in which the switches other than the short-circuit fault determination switch among the switches 14-1 to 14-m included in the switch unit 140 are kept on is referred to as a "partially-on state". The short-circuit fault determination switch is a switch that changes the value of DD1 only when the short-circuit fault determination switch is turned off in a partially turned-on state.
例如，前提A1中的短路故障确定开关是在开关14-1～14-4中的该短路故障确定开关以外的开关维持接通的状况下，当仅该短路故障确定开关被断开时，使DD1的值变化的开关。For example, the short-circuit fault determination switch in the premise A1 is in the condition that the switches other than the short-circuit fault determination switch among the switches 14-1 to 14-4 are kept on, and when only the short-circuit fault determination switch is turned off, the A switch for changing the value of DD1.
在此，对伴随有前提A1的以下的前提B1下的处理进行说明。在前提B1中，驱动电流If0的电流值是12(A)。另外，在前提B1中，光源11-1发生了短路故障。Here, processing under the following premise B1 accompanying the premise A1 will be described. In the premise B1, the current value of the drive current If0 is 12 (A). In addition, in the premise B1, the light source 11-1 has a short-circuit failure.
在所述前提B1的情况下，12(A)的驱动电流If0全部流向光源11-1的电流路径。如上所述，光源11-1的电流路径是从光源11-1到电线EL2的路径。因此，不向作为正常光源的光源11-2～11-4提供电流。因此，电流If2、If3、If4的电流值是0(A)。下面，也将在前提B1中If1、If2、If3、If4的电流值分别是12、0、0、0的状态称为“状态STb1”。In the case of the above-mentioned premise B1, the driving current If0 of 12(A) all flows to the current path of the light source 11-1. As described above, the current path of the light source 11-1 is the path from the light source 11-1 to the electric wire EL2. Therefore, current is not supplied to the light sources 11-2 to 11-4 which are normal light sources. Therefore, the current values of the currents If2 , If3 , If4 are 0 (A). Hereinafter, the states in which the current values of If1, If2, If3, and If4 are 12, 0, 0, and 0 in the premise B1 are also referred to as "state STb1".
此外，在前提B1中，电流检测部130检测的驱动电流If0的电流值是12(A)。另外，因为在前提B1中，12(A)的驱动电流If0全部流向光源11-1的电流路径，因此电流检测部131检测的电流If1的电流值是12(A)。In addition, in the premise B1, the current value of the drive current If0 detected by the current detection unit 130 is 12 (A). In addition, in the premise B1, the drive current If0 of 12(A) all flows to the current path of the light source 11-1, so the current value of the current If1 detected by the current detection unit 131 is 12(A).
另外，在前提B1中，控制部900取得的数字数据DD0、DD1分别示出120、120。在这种情况下，对于DD0、DD1来说，式6的关系不成立。因此，控制部900判定出光源11-1～11-4中的任意光源发生了故障。控制部900还根据DD0＝DD1＝120判定出光源11-1发生了短路故障。然后，控制部900控制开关控制电路15-1，断开设置于发生了短路故障的光源11-1的电流路径上的开关14-1。In addition, in the premise B1, the digital data DD0 and DD1 acquired by the control unit 900 show 120 and 120, respectively. In this case, the relation of Expression 6 does not hold for DD0 and DD1. Therefore, the control unit 900 determines that any of the light sources 11-1 to 11-4 has failed. The control unit 900 also determines that a short-circuit failure has occurred in the light source 11-1 according to DD0=DD1=120. Then, the control unit 900 controls the switch control circuit 15-1 to turn off the switch 14-1 provided on the current path of the short-circuited light source 11-1.
下面，也将在存在故障光源的情况下，向1个正常光源提供的电流的电流值称为“故障存在电流值”。Hereinafter, when there is a faulty light source, the current value of the current supplied to one normal light source is also referred to as a "fault presence current value".
另外，在存在故障光源的情况下，控制部900进行电流判定处理。在电流判定处理中，控制部900进行在各光源11中，向故障光源以外的正常光源提供的电流是否最佳的判定。具体地说，控制部900判定向正常光源提供的电流的电流值(故障存在电流值)是否在额定值(4.5(A))以下。更具体地说，在电流判定处理中，控制部900判定下面的式7的关系是否成立。In addition, when there is a faulty light source, the control unit 900 performs current determination processing. In the current determination process, the control unit 900 determines whether the current supplied to the normal light sources other than the malfunctioning light source is optimal among the light sources 11 . Specifically, the control unit 900 determines whether or not the current value (fault presence current value) of the current supplied to the normal light source is less than a rated value (4.5 (A)). More specifically, in the current determination process, the control unit 900 determines whether or not the relationship of Expression 7 below holds.
(If0/正常光源的数量)≤额定值……(式7)(If0/Number of normal light sources)≤Rated value...(Formula 7)
在式7中，额定值是1个正常光源(光源11)的额定值(额定电流)。此外，在式7的关系成立的情况下，不进行后述的驱动电流变更处理。In Equation 7, the rated value is the rated value (rated current) of one normal light source (light source 11). In addition, when the relationship of Expression 7 holds, the drive current change process described later is not performed.
此外，控制部900在故障存在电流值比额定值大的情况下(式7的关系不成立的情况下)，进行用于变更(重新设定)驱动电流If0的后述的驱动电流变更处理。Also, when the fault presence current value is larger than the rated value (when the relationship of Expression 7 does not hold), control unit 900 performs drive current change processing for changing (resetting) drive current If0 to be described later.
此外，在上述的前提B1中，在开关14-1断开且向作为正常光源的3个光源11提供12(A)的驱动电流If0的情况下，向该各光源11提供的电流的电流值(故障存在电流值)根据12÷3而为4(A)。在这种情况下，因为故障存在电流值(4(A))在额定值(4.5(A))以下，因此判定为没有问题。在这种情况下，不进行驱动电流变更处理。即，在式7的关系成立的情况下，不进行驱动电流If0的变更。In addition, in the above-mentioned premise B1, when the switch 14-1 is turned off and the drive current If0 of 12 (A) is supplied to the three light sources 11 as normal light sources, the current value of the current supplied to the respective light sources 11 is (Fault presence current value) is 4 (A) from 12÷3. In this case, since the current value (4 (A)) is below the rated value (4.5 (A)) due to the presence of a fault, it is determined that there is no problem. In this case, no drive current change processing is performed. That is, when the relationship of Expression 7 holds, the drive current If0 is not changed.
接着，作为另一例子，对伴随有前提A1的以下的前提B2下的处理进行说明。在前提B2中，驱动电流If0的电流值是15(A)。另外，在前提B2中，不存在故障光源。即，光源11-1～11-4是正常光源。Next, as another example, the processing under the following premise B2 accompanying the premise A1 will be described. In the premise B2, the current value of the drive current If0 is 15 (A). In addition, in the premise B2, there is no faulty light source. That is, the light sources 11-1 to 11-4 are normal light sources.
在上述前提B2的情况下，因为根据15÷4＝3.75，向各个作为正常光源的光源11-1～11-4提供额定值(4.5)以下的3.75(A)的电流，因此没有问题。在这种情况下，不进行驱动电流变更处理。下面，也将在前提B2中If1、If2、If3、If4的电流值分别是3.75、3.75、3.75、3.75的状态称为“状态STb2”。In the case of the above-mentioned premise B2, since 15÷4=3.75, a current of 3.75 (A) below the rated value (4.5) is supplied to each of the light sources 11-1 to 11-4 which are normal light sources, so there is no problem. In this case, no drive current change processing is performed. Hereinafter, states where the current values of If1, If2, If3, and If4 are 3.75, 3.75, 3.75, and 3.75 in the premise B2 are also referred to as "state STb2".
接着，还作为另一例子，对伴随有前提A1的以下的前提B3下的处理进行说明。在前提B3中，驱动电流If0的电流值是15(A)。另外，在前提B3中，光源11-1发生短路故障。另外，在前提B3中，假设开关14-1断开。Next, as another example, processing under the following premise B3 accompanied by the premise A1 will be described. In the premise B3, the current value of the drive current If0 is 15 (A). In addition, in the premise B3, the light source 11-1 has a short-circuit failure. In addition, in the premise B3, it is assumed that the switch 14-1 is turned off.
在上述前提B3的情况下，根据15÷3＝5，向各个作为正常光源的光源11-2～11-4提供比额定值(4.5)大的5(A)的电流。即，在前提B3中，假设不采取任何对策则有可能引起进一步的故障。下面，也将在前提B3中If1、If2、If3、If4的电流值分别是0、5、5、5的状态称为“状态STb3”。In the case of the above-mentioned premise B3, according to 15÷3=5, a current of 5 (A) larger than the rated value (4.5) is supplied to each of the light sources 11-2 to 11-4 which are normal light sources. That is, in the premise B3, it is assumed that further failure may be caused if no countermeasure is taken. Hereinafter, the states in which the current values of If1, If2, If3, and If4 are 0, 5, 5, and 5 in the premise B3 are also referred to as "state STb3".
在这种情况下，控制部900进行驱动电流变更处理。在驱动电流变更处理中，控制部900变更(重新设定)驱动电流If0的设定电流值以使故障存在电流值成为额定值以下。具体地说，控制部900控制电流提供部100来变更驱动电流If0的值，以使式7的关系成立。In this case, the control unit 900 performs drive current change processing. In the drive current change process, the control unit 900 changes (resets) the set current value of the drive current If0 so that the fault presence current value becomes equal to or less than the rated value. Specifically, the control unit 900 controls the current supply unit 100 to change the value of the driving current If0 so that the relationship of Expression 7 holds.
例如，在前提B3下的驱动电流变更处理中，控制部900控制电流提供部100，将设定电流值15(A)变更成13(A)。由此，因为13÷3＝4.33，向各个作为正常光源的光源11-2～11-4提供额定值(4.5)以下的4.33(A)的电流，因此没有问题。For example, in the drive current changing process under the premise B3, the control unit 900 controls the current supply unit 100 to change the set current value from 15 (A) to 13 (A). Therefore, since 13÷3=4.33, a current of 4.33 (A) below the rated value (4.5) is supplied to each of the light sources 11-2 to 11-4 which are normal light sources, so there is no problem.
此外，控制部900在电流判定处理之后，根据需要进行开关控制处理。在开关控制处理中，控制部900根据故障光源的种类进行向各光源11的电流提供的控制。In addition, the control unit 900 performs switching control processing as necessary after the current determination processing. In the switching control process, the control unit 900 controls the supply of current to each light source 11 according to the type of the failed light source.
在此，作为一例，对上述的前提B1下的开关控制处理进行说明。在前提B1下的开关控制处理中，控制部900控制开关控制电路15-1而断开设置于发生了短路故障的光源11-1的电流路径上的开关14-1。具体地说，控制部900经由信号线40对开关控制电路15-1进行控制，使得设置于光源11-1的电流路径上的开关14-1的控制信号S1的电平从“H”变成“L”。Here, as an example, the switch control process under the above-mentioned premise B1 will be described. In the switch control process under the premise B1, the control unit 900 controls the switch control circuit 15-1 to turn off the switch 14-1 provided on the current path of the short-circuited light source 11-1. Specifically, the control unit 900 controls the switch control circuit 15-1 through the signal line 40 so that the level of the control signal S1 of the switch 14-1 provided on the current path of the light source 11-1 changes from "H" to "H". "L".
当控制信号S1的电平变为“L”时，开关14-1成为断开状态，以切断电流。由此，电流不向光源11-1的电流路径流动。其结果为，将从电流提供部100提供的12(A)的驱动电流If0均等地一分为三而得到的4(A)的电流均等地向各个作为正常光源的光源11-2～11-4提供。When the level of the control signal S1 becomes "L", the switch 14-1 is turned off to cut off the current. Accordingly, current does not flow to the current path of the light source 11-1. As a result, the current of 4 (A) obtained by equally dividing the drive current If0 of 12 (A) supplied from the current supply unit 100 into three is equally supplied to the light sources 11-2 to 11- 4 provided.
分别向光源11-2、11-3、11-4提供的电流If2、If3、If4的电流值根据12÷3＝4是额定值(4.5)以下的4(A)。即，分别向光源11-2、11-3、11-4提供4(A)的电流If2、If3、If4。由此，光源部110(光源11-2、11-3、11-4)正常地点亮，上述的影像显示装置能够使用光源部110发出的光正常地显示影像。The current values of currents If2 , If3 , If4 supplied to light sources 11 - 2 , 11 - 3 , 11 - 4 are 4 (A) below the rated value (4.5) from 12÷3=4. That is, currents If2, If3, If4 of 4 (A) are supplied to the light sources 11-2, 11-3, 11-4, respectively. Accordingly, the light source unit 110 (light sources 11-2, 11-3, 11-4) is normally turned on, and the video display device described above can normally display images using the light emitted by the light source unit 110 .
接着，作为再一例子，对伴随有前提A1的以下的前提B4下的处理进行说明。在前提B4中，驱动电流If0的电流值是12(A)。另外，在前提B4中，光源11-3发生了短路故障。Next, as yet another example, processing under the following premise B4 accompanying the premise A1 will be described. In the premise B4, the current value of the drive current If0 is 12 (A). In addition, in the premise B4, the light source 11-3 has a short-circuit failure.
在所述前提B4的情况下，12(A)的驱动电流If0全部流向光源11-3的电流路径。在此，光源11-3的电流路径是从光源11-3到电线EL2的路径。因此，电流If3的电流值是12(A)。因此，不向作为正常光源的光源11-1、11-2、11-4提供电流。因此，电流If1、If2、If4的电流值是0(A)。下面，也将在前提B4中If1、If2、If3、If4的电流值分别是0、0、12、0的状态称为“状态STb4”。In the case of the above-mentioned premise B4, the drive current If0 of 12(A) all flows to the current path of the light source 11-3. Here, the current path of the light source 11-3 is a path from the light source 11-3 to the electric wire EL2. Therefore, the current value of the current If3 is 12 (A). Therefore, current is not supplied to the light sources 11-1, 11-2, 11-4 which are normal light sources. Therefore, the current values of the currents If1 , If2 , If4 are 0 (A). Hereinafter, the states in which the current values of If1, If2, If3, and If4 are 0, 0, 12, and 0 in the premise B4 are also referred to as "state STb4".
此外，在前提B4中，电流检测部130检测出的驱动电流If0的电流值是12(A)。另外，在前提B4中，控制部900取得的数字数据DD0、DD1根据式5分别示出120、0。In addition, in the premise B4, the current value of the drive current If0 detected by the current detection unit 130 is 12 (A). In addition, in the premise B4, the digital data DD0 and DD1 acquired by the control unit 900 represent 120 and 0, respectively, from Equation 5.
在这种情况下，对于DD0、DD1来说，式6的关系不成立。因此，控制部900判定为光源11-1～11-4中的任意光源发生了故障。另外，控制部900还进行用于确定发生短路故障的故障光源(短路故障光源)的依次断开控制处理T。在依次断开控制处理T中，依次仅断开开关14-1～14-4中的任意一个，之后接通。In this case, the relation of Expression 6 does not hold for DD0 and DD1. Therefore, the control unit 900 determines that any of the light sources 11-1 to 11-4 has failed. In addition, the control unit 900 also performs a sequential turn-off control process T for specifying a faulty light source (short-circuit faulty light source) in which a short-circuit fault has occurred. In the sequential opening control process T, only any one of the switches 14-1 to 14-4 is sequentially turned off and then turned on.
具体地说，在依次断开控制处理T中，控制部900控制开关控制电路15-1～15-4使得依次仅断开作为短路故障判定开关的开关14-1～14-4中的任意一个。Specifically, in the sequential opening control process T, the control unit 900 controls the switch control circuits 15-1 to 15-4 so that only any one of the switches 14-1 to 14-4 serving as short-circuit failure determination switches is sequentially turned off. .
具体地说，在依次断开控制处理T中，首先，控制部900控制开关控制电路15-1，使得在开关14-2、14-3、14-4维持接通的状况下仅断开开关14-1。即使开关14-1断开，在前提B4中，原本也不向光源11-1流过电流。因此，DD0、DD1的值不变化。然后，控制部900控制开关控制电路15-1使得开关14-1接通。Specifically, in the sequential opening control process T, first, the control unit 900 controls the switch control circuit 15-1 so that only the switches 14-2, 14-3, and 14-4 are turned off while the switches 14-2, 14-3, and 14-4 are kept on. 14-1. Even if the switch 14-1 is turned off, in the premise B4, the current does not flow to the light source 11-1 originally. Therefore, the values of DD0 and DD1 do not change. Then, the control unit 900 controls the switch control circuit 15-1 so that the switch 14-1 is turned on.
接着，控制部900控制开关控制电路15-2，使得在开关14-1、14-3、14-4维持接通的状况下仅断开开关14-2。即使开关14-2断开，在前提B4中，原本也不向光源11-2流过电流。因此，DD0、DD1的值不变化。然后，控制部900控制开关控制电路15-2使得开关14-2接通。Next, the control unit 900 controls the switch control circuit 15-2 so that only the switch 14-2 is turned off while the switches 14-1, 14-3, and 14-4 are kept on. Even if the switch 14-2 is turned off, in the premise B4, the current does not flow to the light source 11-2 originally. Therefore, the values of DD0 and DD1 do not change. Then, the control unit 900 controls the switch control circuit 15-2 so that the switch 14-2 is turned on.
接着，控制部900控制开关控制电路15-3，使得在开关14-1、14-2、14-4维持接通的状况下仅断开开关14-3。在开关14-3断开的状况下，不向发生了短路故障的光源11-3流过电流。因此，12(A)的驱动电流If0均等地一分为三而得到的4(A)的电流流向各个光源11-1、11-2、11-4。在这种情况下，电流If1、If2、If4的电流值是4(A)。因此，光源11-1、11-2、11-4点亮。由此，上述的影像显示装置能够使用光源部110发出的光正常地显示影像。Next, the control unit 900 controls the switch control circuit 15-3 so that only the switch 14-3 is turned off while the switches 14-1, 14-2, and 14-4 are kept on. When the switch 14-3 is off, current does not flow to the light source 11-3 in which the short-circuit fault occurred. Therefore, a current of 4 (A) obtained by equally dividing the drive current If0 of 12 (A) into three flows to the respective light sources 11 - 1 , 11 - 2 , and 11 - 4 . In this case, the current values of the currents If1, If2, If4 are 4 (A). Therefore, the light sources 11-1, 11-2, and 11-4 are turned on. Thus, the above-mentioned image display device can normally display images using the light emitted from the light source unit 110 .
在上述的部分接通状况中，在仅断开开关14-3的情况下，DD0、DD1根据式5分别示出120、40。即，DD1的值变化。因此，短路故障确定开关是开关14-3。在设置于短路故障光源的电流路径上的开关14-3是短路故障确定开关的情况下，该短路故障光源是光源11-3。由此，控制部900确定短路故障光源是光源11-3。In the above-mentioned partially turned-on condition, when only the switch 14-3 is turned off, DD0, DD1 represent 120, 40 according to Eq. 5, respectively. That is, the value of DD1 changes. Therefore, the short-circuit fault determination switch is the switch 14-3. In the case where the switch 14-3 provided on the current path of the short-circuit fault light source is a short-circuit fault determination switch, the short-circuit fault light source is the light source 11-3. Thus, the control unit 900 determines that the short-circuit faulty light source is the light source 11-3.
另外，控制部900确定出向除了光源11-3之外的各个作为正常光源的光源11-1、11-2、11-4提供的电流的电流值(故障存在电流值)是4(A)。因为故障存在电流值是额定值4.5(A)以下，因此控制部900不进行上述的驱动电流变更处理。由此，光源11-1、11-2、11-4能够原样维持点亮的状态。由此，上述的影像显示装置能够使用光源部110发出的光正常地显示影像。In addition, the control section 900 determines that the current value (fault presence current value) of the current supplied to each of the light sources 11-1, 11-2, and 11-4 as normal light sources other than the light source 11-3 is 4 (A). Since the fault presence current value is less than the rated value of 4.5 (A), the control unit 900 does not perform the drive current change process described above. Thereby, the light sources 11-1, 11-2, and 11-4 can maintain the turned-on state as it is. Thus, the above-mentioned image display device can normally display images using the light emitted from the light source unit 110 .
接着，对光源11发生了开路故障的情况进行说明。在此，对伴随有前提A1的以下的前提C1下的处理进行说明。在前提C1中，驱动电流If0的电流值是12(A)。另外，在前提C1中，光源11-1发生开路故障。Next, a case where an open failure occurs in the light source 11 will be described. Here, processing under the following premise C1 accompanying the premise A1 will be described. In the premise C1, the current value of the drive current If0 is 12 (A). In addition, in the premise C1, the light source 11-1 has an open circuit failure.
在上述前提C1的情况下，电流完全不流向光源11-1的电流路径。另一方面，12(A)的驱动电流If0均等地一分为三而得到的4(A)的电流向各个光源11-2、11-3、11-4。因此，电流If2、If3、If4的电流值是4(A)。下面，也将前提C1中If1、If2、If3、If4的电流值分别是0、4、4、4的状态称为“状态STc1”。In the case of the above-mentioned premise C1, the current does not flow to the current path of the light source 11-1 at all. On the other hand, the drive current If0 of 12 (A) is equally divided into three and the current of 4 (A) is supplied to each light source 11-2, 11-3, 11-4. Therefore, the current values of the currents If2 , If3 , If4 are 4 (A). Hereinafter, states in which the current values of If1, If2, If3, and If4 are 0, 4, 4, and 4 in the premise C1 are also referred to as "state STc1".
此外，在前提C1中，电流检测部130检测出的驱动电流If0的电流值是12(A)。另外，在前提C1中，如上所述，因为完全不向光源11-1的电流路径流过电流，因此电流检测部131检测出的电流If1的电流值是0(A)。In addition, in the premise C1, the current value of the drive current If0 detected by the current detection unit 130 is 12 (A). In addition, in the premise C1, as described above, since no current flows through the current path of the light source 11 - 1 , the current value of the current If1 detected by the current detection unit 131 is 0 (A).
另外，在前提C1中，控制部900取得的数字数据DD0、DD1根据式5分别示出120、0。在这种情况下，对于DD0、DD1来说，式6的关系不成立。因此，控制部900判定为光源11-1～11-4中的任意光源发生了故障。In addition, in the premise C1, the digital data DD0 and DD1 acquired by the control unit 900 represent 120 and 0, respectively, from Equation 5. In this case, the relation of Expression 6 does not hold for DD0 and DD1. Therefore, the control unit 900 determines that any of the light sources 11-1 to 11-4 has failed.
另外，控制部900还进行用于确定发生开路故障的故障光源(开路故障光源)的依次断开控制处理K。在依次断开控制处理K中，依次仅断开开关14-1～14-4中的任意一个，之后接通。In addition, the control unit 900 also performs a sequential turn-off control process K for specifying a failed light source (open failed light source) in which an open failed. In the sequential off control process K, only any one of the switches 14-1 to 14-4 is sequentially turned off and then turned on.
如果即使在通过依次断开控制处理K断开各开关14的情况下DD0、DD1的值也一次没发生变化，则存在开路故障光源，该开路故障光源是光源11-1。If the values of DD0, DD1 do not change once even when each switch 14 is turned off by the sequential opening control process K, there is an open fault light source which is the light source 11-1.
另一方面，在通过依次断开控制处理K而依次断开各开关14从而发生了DD0、DD1的值变化之时以及DD0、DD1的值不变化之时的情况下，存在开路故障光源。另外，该开路故障光源是存在于包含有即使被断开也不使DD0、DD1的值变化的开关14的光源11的电流路径上的该光源11。On the other hand, when the values of DD0 and DD1 change and when the values of DD0 and DD1 do not change by sequentially turning off each switch 14 through the sequential turning off control process K, there is an open fault light source. In addition, the open fault light source is the light source 11 that exists on the current path of the light source 11 including the switch 14 that does not change the values of DD0 and DD1 even when it is turned off.
具体地说，在依次断开控制处理K中，控制部900控制开关控制电路15-1～15-4使得依次仅断开开关14-1～14-4的任意一个。Specifically, in the sequential opening control process K, the control unit 900 controls the switch control circuits 15-1 to 15-4 so that only any one of the switches 14-1 to 14-4 is sequentially turned off.
具体地说，在依次断开控制处理K中，首先，控制部900控制开关控制电路15-1，使得在开关14-2、14-3、14-4维持接通的状况下仅断开开关14-1。即使开关14-1断开，在前提C1中，原本也不向光源11-1流过电流。因此，DD0、DD1的值不变化。然后，控制部900控制开关控制电路15-1使得开关14-1接通。Specifically, in the sequential opening control process K, first, the control unit 900 controls the switch control circuit 15-1 so that only the switches 14-2, 14-3, and 14-4 are turned off while the switches 14-2, 14-3, and 14-4 are kept on. 14-1. Even if the switch 14-1 is turned off, in the premise C1, the current does not flow to the light source 11-1 originally. Therefore, the values of DD0 and DD1 do not change. Then, the control unit 900 controls the switch control circuit 15-1 so that the switch 14-1 is turned on.
接着，控制部900控制开关控制电路15-2，使得在开关14-1、14-3、14-4维持接通的状况下仅断开开关14-2。即使开关14-2断开，在前提C1中，原本也不向光源11-2流过电流。因此，DD0、DD1的值不变化。然后，控制部900控制开关控制电路15-2使得开关14-2接通。Next, the control unit 900 controls the switch control circuit 15-2 so that only the switch 14-2 is turned off while the switches 14-1, 14-3, and 14-4 are kept on. Even if the switch 14-2 is turned off, in the premise C1, the current does not flow to the light source 11-2 originally. Therefore, the values of DD0 and DD1 do not change. Then, the control unit 900 controls the switch control circuit 15-2 so that the switch 14-2 is turned on.
接着，控制部900控制开关控制电路15-3，使得在开关14-1、14-2、14-4维持接通的状况下仅断开开关14-3。即使在这种情况下，在前提C1中，DD0、DD1的值也不变化。然后，控制部900控制开关控制电路15-3使得开关14-3接通。Next, the control unit 900 controls the switch control circuit 15-3 so that only the switch 14-3 is turned off while the switches 14-1, 14-2, and 14-4 are kept on. Even in this case, the values of DD0 and DD1 do not change in the premise C1. Then, the control unit 900 controls the switch control circuit 15-3 so that the switch 14-3 is turned on.
接着，控制部900控制开关控制电路15-4，使得在开关14-1、14-2、14-3维持接通的状况下仅开关14-4断开。即使在这种情况下，在前提C1中，DD0、DD1的值也不变化。然后，控制部900控制开关控制电路15-4使得开关14-4接通。Next, the control unit 900 controls the switch control circuit 15-4 so that only the switch 14-4 is turned off while the switches 14-1, 14-2, and 14-3 are kept on. Even in this case, the values of DD0 and DD1 do not change in the premise C1. Then, the control unit 900 controls the switch control circuit 15-4 so that the switch 14-4 is turned on.
如上所述，如果即使在通过依次断开控制处理K断开各开关14的情况下DD0、DD1的值也一次没发生变化，则存在开路故障光源，该开路故障光源是光源11-1。因此，控制部900确定出开路故障光源是光源11-1。As described above, if the values of DD0, DD1 do not change once even when each switch 14 is turned off by the sequential opening control process K, there is an open fault light source which is the light source 11-1. Therefore, the control unit 900 determines that the open fault light source is the light source 11-1.
另外，在前提C1下，控制部900确定出向除了光源11-1之外的各个作为正常光源的光源11-2、11-3、11-4提供的电流的电流值(故障存在电流值)是4(A)。因为故障存在电流值是额定值(4.5(A)以下，因此控制部900不进行上述的驱动电流变更处理。由此，光源11-2、11-3、11-4能够原样维持点亮的状态。由此，上述的影像显示装置能够使用光源部110发出的光正常地显示影像。In addition, under the premise C1, the control unit 900 determines that the current value (fault presence current value) of the current supplied to each of the light sources 11-2, 11-3, and 11-4 as normal light sources other than the light source 11-1 is 4(A). Since the fault presence current value is less than the rated value (4.5 (A), the control unit 900 does not perform the above-mentioned drive current change process. Thereby, the light sources 11-2, 11-3, and 11-4 can maintain the lighting state as they are. Thus, the image display device described above can normally display images using the light emitted from the light source unit 110 .
接着，作为另一例子，对伴随有前提A1的以下的前提C2下的处理进行说明。在前提C2中，驱动电流If0的电流值是12(A)。另外，在前提C2中，光源11-4发生开路故障。Next, as another example, processing under the following premise C2 accompanying the premise A1 will be described. In the premise C2, the current value of the drive current If0 is 12 (A). In addition, in the premise C2, the light source 11-4 has an open circuit failure.
在所述前提C2的情况下，电流完全不流向光源11-4的电流路径。因此，电流If4的电流值是0(A)。另一方面，12(A)的驱动电流If0均等地一分为三而得到的4(A)的电流流向各个光源11-1、11-2、11-3。因此，电流If1、If2、If3的电流值是4(A)。In the case of the above-mentioned premise C2, the current does not flow to the current path of the light source 11-4 at all. Therefore, the current value of the current If4 is 0 (A). On the other hand, a current of 4 (A) obtained by equally dividing the drive current If0 of 12 (A) into three flows to the respective light sources 11 - 1 , 11 - 2 , and 11 - 3 . Therefore, the current values of the currents If1, If2, If3 are 4 (A).
此外，在前提C2中，电流检测部130检测出的驱动电流If0的电流值是12(A)。另外，在前提C2中，电流检测部131检测出的电流If1的电流值是4(A)。下面，也将前提C2中If1、If2、If3、If4的电流值分别是4、4、4、0的状态称为“状态STc2”。In addition, in the premise C2, the current value of the drive current If0 detected by the current detection unit 130 is 12 (A). In addition, in the premise C2, the current value of the current If1 detected by the current detection unit 131 is 4 (A). Hereinafter, the states in which the current values of If1, If2, If3, and If4 in the premise C2 are 4, 4, 4, and 0 are also referred to as "state STc2".
另外，在前提C2中，控制部900取得的数字数据DD0、DD1根据式5分别示出120、40。在这种情况下，对于DD0、DD1来说，式6的关系不成立。因此，控制部900判定为光源11-1～11-4中的任意光源发生了故障。In addition, in the premise C2, the digital data DD0 and DD1 acquired by the control unit 900 represent 120 and 40, respectively, from Equation 5. In this case, the relation of Expression 6 does not hold for DD0 and DD1. Therefore, the control unit 900 determines that any of the light sources 11-1 to 11-4 has failed.
另外，控制部900还如上述那样进行用于确定开路故障的故障光源(开路故障光源)的依次断开控制处理K。In addition, the control unit 900 also performs the sequential turn-off control process K for specifying a failed light source (open failed light source) as described above.
如上所述，在依次断开控制处理K中，首先，控制部900控制开关控制电路15-1使得在开关14-2、14-3、14-4维持接通的状况下仅开关14-1断开。由此，电流不流向光源11-1的电流路径。As described above, in the sequential opening control process K, first, the control unit 900 controls the switch control circuit 15-1 such that only the switch 14-1 is turned on while the switches 14-2, 14-3, and 14-4 are kept on. disconnect. Thus, current does not flow to the current path of the light source 11-1.
此外，在前提C2中，电流检测部130检测出的驱动电流If0的电流值是12(A)。另外，如上所述，因为在前提C2中仅断开开关14-1的情况下，电流不流向光源11-1的电流路径，因此电流检测部131检测的电流If1的电流值从4(A)变化到0(A)。因此，DD0维持120，DD1根据式5成为0。然后，控制部900控制开关控制电路15-1使得开关14-1接通。In addition, in the premise C2, the current value of the drive current If0 detected by the current detection unit 130 is 12 (A). In addition, as described above, since the current does not flow to the current path of the light source 11-1 when only the switch 14-1 is turned off in the premise C2, the current value of the current If1 detected by the current detection part 131 changes from 4 (A) to 4 (A). Change to 0 (A). Therefore, DD0 remains at 120, and DD1 becomes 0 according to Formula 5. Then, the control unit 900 controls the switch control circuit 15-1 so that the switch 14-1 is turned on.
接着，控制部900控制开关控制电路15-2使得在开关14-1、14-3、14-4维持接通的状况下仅断开开关14-2。由此，除了作为开路故障光源的光源11-4之外，电流也不流向光源11-2。因此，将12(A)的驱动电流If0一分为二而得到的6(A)的电流流向各个光源11-1、11-3。即，电流If1、If3的电流值是6(A)。因此，DD0维持120，DD1根据式5成为60。然后，控制部900控制开关控制电路15-2使得开关14-2接通。Next, the control unit 900 controls the switch control circuit 15-2 so that only the switch 14-2 is turned off while the switches 14-1, 14-3, and 14-4 are kept on. Thus, current does not flow to the light source 11-2 except for the light source 11-4 which is an open fault light source. Therefore, a current of 6 (A) obtained by dividing the driving current If0 of 12 (A) into two flows to the respective light sources 11 - 1 , 11 - 3 . That is, the current values of the currents If1 and If3 are 6 (A). Therefore, DD0 remains at 120, and DD1 becomes 60 according to Formula 5. Then, the control unit 900 controls the switch control circuit 15-2 so that the switch 14-2 is turned on.
接着，控制部900控制开关控制电路15-3使得在开关14-1、14-2、14-4维持接通的状况下仅开关14-3断开。由此，除了作为开路故障光源的光源11-4之外，电流也不流向光源11-3。因此，将12(A)的驱动电流If0一分为二而得到的6(A)的电流流向各个光源11-1、11-2。即，电流If1、If2的电流值是6(A)。因此，DD0维持120，DD1根据式5成为60。然后，控制部900控制开关控制电路15-3使得开关14-3接通。Next, the control unit 900 controls the switch control circuit 15-3 so that only the switch 14-3 is turned off while the switches 14-1, 14-2, and 14-4 are kept on. Thus, current does not flow to the light source 11-3 except for the light source 11-4 which is an open fault light source. Therefore, a current of 6 (A) obtained by dividing the drive current If0 of 12 (A) into two flows to the respective light sources 11 - 1 , 11 - 2 . That is, the current values of the currents If1 and If2 are 6 (A). Therefore, DD0 remains at 120, and DD1 becomes 60 according to Formula 5. Then, the control unit 900 controls the switch control circuit 15-3 so that the switch 14-3 is turned on.
接着，控制部900控制开关控制电路15-4使得在开关14-1、14-2、14-3维持接通的状况下仅开关14-4断开。即使开关14-4断开，在前提C2中，原本电流也不流向光源11-4。因此，电流If1、If2、If3、If4不变化。即，电流If1、If2、If3的电流值是4(A)。另外，电流If4的电流值是0(A)。Next, the control unit 900 controls the switch control circuit 15-4 such that only the switch 14-4 is turned off while the switches 14-1, 14-2, and 14-3 are kept on. Even if the switch 14-4 is turned off, in the premise C2, the current does not originally flow to the light source 11-4. Therefore, the currents If1, If2, If3, If4 do not change. That is, the current values of the currents If1 , If2 , If3 are 4 (A). In addition, the current value of the current If4 is 0 (A).
此外，在前提C2中，电流检测部130检测出的驱动电流If0的电流值是12(A)。另外，在前提C2中，电流检测部131检测出的电流If1的电流值是4(A)。In addition, in the premise C2, the current value of the drive current If0 detected by the current detection unit 130 is 12 (A). In addition, in the premise C2, the current value of the current If1 detected by the current detection unit 131 is 4 (A).
另外，在前提C2中，控制部900取得的数字数据DD0、DD1根据式5分别示为120、40。然后，控制部900控制开关控制电路15-4使得开关14-4接通。In addition, in the premise C2, the digital data DD0 and DD1 acquired by the control unit 900 are respectively expressed as 120 and 40 according to Expression 5. Then, the control unit 900 controls the switch control circuit 15-4 so that the switch 14-4 is turned on.
如上所述，在通过依次断开控制处理K而依次断开各开关14从而发生DD0、DD1的值变化之时和DD0、DD1的值不变化之时的情况下，存在开路故障光源。另外，该开路故障光源是存在于包含有即使被断开也不使DD0、DD1的值变化的开关14的光源11的电流路径上的该光源11。此外，在上述的前提C2中，不使DD0、DD1的值变化的开关是开关14-4。因此，开路故障光源是存在于包含有开关14-4的、光源11-4的电流路径上的该光源11-4。因此，控制部900确定出开路故障光源是光源11-4。As described above, when the values of DD0 and DD1 change and when the values of DD0 and DD1 do not change by sequentially turning off each switch 14 through the sequential turning off control process K, there is an open fault light source. In addition, the open fault light source is the light source 11 that exists on the current path of the light source 11 including the switch 14 that does not change the values of DD0 and DD1 even when it is turned off. In addition, in the above-mentioned premise C2, the switch that does not change the values of DD0 and DD1 is the switch 14-4. Therefore, the open fault light source is the light source 11-4 present on the current path of the light source 11-4 including the switch 14-4. Therefore, the control section 900 determines that the open fault light source is the light source 11-4.
另外，控制部900确定出向除了光源11-4之外的各个作为正常光源的光源11-1、11-2、11-3提供的电流的电流值(故障存在电流值)是4(A)。因为故障存在电流值是额定值(4.5(A)以下，因此控制部900不进行上述的驱动电流变更处理。由此，光源11-1、11-2、11-3能够原样维持点亮的状态。由此，上述的影像显示装置能够使用光源部110发出的光正常地显示影像。In addition, the control section 900 determines that the current value (fault presence current value) of the current supplied to each of the light sources 11-1, 11-2, and 11-3 as normal light sources other than the light source 11-4 is 4 (A). Since the fault presence current value is less than the rated value (4.5 (A), the control unit 900 does not perform the above-mentioned drive current change process. Thereby, the light sources 11-1, 11-2, and 11-3 can maintain the lighting state as they are. Thus, the image display device described above can normally display images using the light emitted from the light source unit 110 .
接着，对控制部900用于进行所述处理的处理(下面也称为驱动电流管理处理)进行说明。图4是驱动电流管理处理的流程图。下面，作为一例，对下面的前提D1中的驱动电流管理处理进行说明。Next, the processing (hereinafter also referred to as drive current management processing) for the control unit 900 to perform the processing will be described. FIG. 4 is a flowchart of drive current management processing. Next, as an example, the driving current management process in the following premise D1 will be described.
在前提D1中，光源控制装置1000的结构是图2所示的结构。即，在前提D1中，光源部110包括光源11-1、11-2、11-3、11-4。另外，在前提D1中，各个光源11-1～11-4的额定值(额定电流)是4.5(A)。In the premise D1, the structure of the light source control device 1000 is the structure shown in FIG. 2 . That is, in the premise D1, the light source unit 110 includes the light sources 11-1, 11-2, 11-3, and 11-4. In addition, in the premise D1, the rated value (rated current) of each light source 11-1 to 11-4 is 4.5 (A).
在驱动电流管理处理中，首先执行步骤S110的处理。下面，也将用于获得上述的目标亮度的、使用者期望的驱动电流If0的电流值称为“期望电流值”。In the drive current management process, first, the process of step S110 is executed. Hereinafter, the current value of the driving current If0 desired by the user for obtaining the above-mentioned target luminance is also referred to as a "desired current value".
在步骤S110中，进行驱动电流设定处理。在驱动电流设定处理中，控制部900对电流提供部100进行该电流提供部100提供的驱动电流If0的电流值的设定。具体地说，控制部900控制电流提供部100，将驱动电流If0的电流值设定成期望电流值。如上所述，也将设定成期望电流值的驱动电流If0的电流值称为“设定电流值”。由此，电流提供部100向光源部110提供设定电流值(期望电流值)的驱动电流If0。In step S110, a drive current setting process is performed. In the drive current setting process, the control unit 900 sets the current value of the drive current If0 supplied by the current supply unit 100 to the current supply unit 100 . Specifically, the control unit 900 controls the current supply unit 100 to set the current value of the drive current If0 to a desired current value. As described above, the current value of the drive current If0 set to the desired current value is also referred to as a "set current value". Thus, the current supply unit 100 supplies the drive current If0 of the set current value (desired current value) to the light source unit 110 .
接着，如上所述，为了使上述的实际电流值与设定电流值相等，而进行下面的步骤S121的处理。在步骤S121中，进行DD0的取得。具体地说，控制部900从AD转换器200取得(读取)最新的数字数据DD0。Next, as described above, in order to make the above-mentioned actual current value equal to the set current value, the following step S121 is performed. In step S121, DD0 is acquired. Specifically, the control unit 900 acquires (reads) the latest digital data DD0 from the AD converter 200 .
在步骤S122中，判定实际电流值是否与设定电流值相等。具体地说，控制部900判定上述式5即DD0＝If0×10的关系是否成立。如果在步骤S122中为是，则处理转入步骤S130。另一方面，如果在步骤S122中为否，则处理转入步骤S123。In step S122, it is determined whether the actual current value is equal to the set current value. Specifically, the control unit 900 determines whether or not the relationship of DD0=If0×10, which is the above-mentioned Expression 5, holds. If YES in step S122, the process proceeds to step S130. On the other hand, if NO in step S122, the process proceeds to step S123.
在步骤S123中，进行电流值变更处理。在电流值变更处理中，在实际电流值比设定电流值大的情况下，控制部900控制电流提供部100使当前的设定电流值比该设定电流值小，以使得当前的实际电流值变小。例如，使当前的设定电流值成为0.9倍。In step S123, current value change processing is performed. In the current value changing process, when the actual current value is larger than the set current value, the control unit 900 controls the current supply unit 100 to make the current set current value smaller than the set current value so that the current actual current value becomes smaller. For example, the current set current value is multiplied by 0.9.
另一方面，在实际电流值比设定电流值小的情况下，控制部900控制电流提供部100使当前的设定电流值比该设定电流值大，使得当前的实际电流值变大。例如，使当前的设定电流值成为1.1倍。然后，再次执行步骤S121的处理。重复执行步骤S121、S123的处理，直到在步骤S122中判定为是为止。由此，控制成实际电流值与设定电流值相等。On the other hand, when the actual current value is smaller than the set current value, the control unit 900 controls the current supply unit 100 to make the current set current value larger than the set current value so that the current actual current value becomes larger. For example, the current set current value is multiplied by 1.1. Then, the processing of step S121 is executed again. The processing of steps S121 and S123 is repeatedly executed until it is determined as YES in step S122. Thus, control is performed so that the actual current value is equal to the set current value.
在步骤S130中，进行测量处理。在测量处理中，控制部900从AD转换器200取得(读取)最新的数字数据DD0、DD1。In step S130, measurement processing is performed. In the measurement process, the control unit 900 acquires (reads) the latest digital data DD0 and DD1 from the AD converter 200 .
下面，也将在光源11-1～11-m中不存在发生故障的故障光源的状态称为“正常状态”。即，正常状态是在光源部110中不存在故障光源的状态。此外，正常状态是电流If1～Ifm的电流值是比0大的值且是各光源11的额定值(4.5)以下的值的状态。正常状态例如是上述的状态STa1或者状态STb2。Hereinafter, a state in which no faulty light source fails among the light sources 11-1 to 11-m is also referred to as a "normal state". That is, the normal state is a state in which there is no faulty light source in the light source unit 110 . In addition, the normal state is a state in which the current values of the currents If1 to Ifm are larger than 0 and equal to or less than the rated value (4.5) of each light source 11 . The normal state is, for example, the above-mentioned state STa1 or state STb2.
另外，下面，也将在光源11-1～11-m中存在短路故障光源的状态称为“短路故障状态”。短路故障状态例如是上述的状态STb1、状态STb3或者状态STb4。另外，下面，也将在光源11-1～11-m中存在开路故障光源的状态称为“开路故障状态”。开路故障状态例如是上述的状态STc1或者状态STc2。In addition, below, the state in which a short-circuit failure light source exists among the light sources 11-1 to 11-m is also referred to as a "short-circuit failure state". The short-circuit fault state is, for example, the above-mentioned state STb1 , state STb3 or state STb4 . In addition, below, the state in which an open failure light source exists among the light sources 11-1 to 11-m is also referred to as an "open failure state". The open fault state is, for example, the above-mentioned state STc1 or state STc2.
在步骤S140中，进行状态判定处理。在状态判定处理中，控制部900根据数字数据DD0、DD1来判定是否存在故障光源。具体地说，在状态判定处理中，控制部900根据数字数据DD0、DD1所示的值来判定光源部110的状态是正常状态、短路故障状态以及开路故障状态中的哪一种。In step S140, state determination processing is performed. In the status determination process, the control unit 900 determines whether or not there is a faulty light source based on the digital data DD0 and DD1 . Specifically, in the state determination process, the control unit 900 determines whether the state of the light source unit 110 is a normal state, a short-circuit fault state, or an open-circuit fault state based on the values indicated by the digital data DD0 and DD1 .
此外，数字数据DD0是基于电流检测部130检测出的驱动电流If0的电流值的数据。另外，数字数据DD1是基于电流检测部131检测出的电流If1的电流值的数据。即，在状态判定处理中，控制部900根据电流检测部130检测出的驱动电流If0、和电流检测部131检测出的电流If1来判定在包含于光源部110的多个光源11中是否存在故障光源。即，状态判定处理是根据电流检测部130检测出的驱动电流If0、和电流检测部131检测出的电流If1来判定在包含于光源部110的多个光源11中是否存在故障光源的处理。In addition, the digital data DD0 is data based on the current value of the drive current If0 detected by the current detection unit 130 . In addition, the digital data DD1 is data based on the current value of the current If1 detected by the current detection unit 131 . That is, in the state determination process, the control unit 900 determines whether or not there is a failure among the plurality of light sources 11 included in the light source unit 110 based on the drive current If0 detected by the current detection unit 130 and the current If1 detected by the current detection unit 131. light source. That is, the state determination process is a process for determining whether there is a faulty light source among the plurality of light sources 11 included in the light source unit 110 based on the drive current If0 detected by the current detection unit 130 and the current If1 detected by the current detection unit 131 .
首先，在状态判定处理中执行步骤S141的处理。在步骤S141中，控制部900对DD0、DD1判定式6(DD0＝DD1×4)的关系是否成立。对于DD0、DD1来说，在DD0＝DD1×4的关系成立的情况下(在S141中为是的情况下)，控制部900判定光源部110的状态是正常状态。在这种情况下，处理再次转入步骤S130。First, the process of step S141 is executed in the state determination process. In step S141 , the control unit 900 determines whether or not the relationship of Expression 6 (DD0=DD1×4) holds for DD0 and DD1. With respect to DD0 and DD1, when the relationship of DD0=DD1×4 holds true (YES in S141), the control unit 900 determines that the state of the light source unit 110 is a normal state. In this case, the process proceeds to step S130 again.
另一方面，对于DD0、DD1来说，在DD0＝DD1×4的关系不成立的情况下(在S141中为否)，控制部900判定为光源部110的状态处于短路故障状态和开路故障状态中的任意一种。即，在DD0＝DD1×4的关系不成立的情况下，控制部900判定为存在故障光源。在这种情况下，处理转入步骤S142。On the other hand, for DD0 and DD1, when the relationship of DD0=DD1×4 does not hold (NO in S141), the control unit 900 determines that the state of the light source unit 110 is in the short-circuit failure state and the open-circuit failure state. any of the That is, when the relationship of DD0=DD1×4 does not hold, the control unit 900 determines that there is a faulty light source. In this case, the process proceeds to step S142.
在步骤S142中，控制部900对DD0、DD1判定DD0＝DD1的关系是否成立。在DD0＝DD1的关系成立的情况下，控制部900判定为光源部110的状态是短路故障状态。即，控制部900判定为存在短路故障光源。In step S142, the control part 900 determines whether the relationship of DD0=DD1 is established with respect to DD0 and DD1. When the relationship of DD0=DD1 is established, the control unit 900 determines that the state of the light source unit 110 is a short-circuit failure state. That is, the control unit 900 determines that there is a short-circuit faulty light source.
如果在步骤S142中为是，则处理转入步骤S200。另一方面，如果在步骤S142中为否，则处理转入后述的步骤S143。If YES in step S142, the process proceeds to step S200. On the other hand, if NO in step S142, the process proceeds to step S143 described later.
在步骤S200中进行故障光源确定处理。在故障光源确定处理中，控制部900根据数字数据DD0、DD1来确定故障光源。如上所述，数字数据DD0是基于电流检测部130检测出的驱动电流If0的电流值的数据。另外，数字数据DD1是基于电流检测部131检测出的电流If1的电流值的数据。即，在故障光源确定处理中，控制部900根据驱动电流If0和电流If1来确定故障光源。In step S200, a faulty light source determination process is performed. In the faulty light source identifying process, the control unit 900 identifies a faulty light source based on the digital data DD0, DD1. As described above, the digital data DD0 is data based on the current value of the drive current If0 detected by the current detection unit 130 . In addition, the digital data DD1 is data based on the current value of the current If1 detected by the current detection unit 131 . That is, in the malfunctioning light source identification process, the control unit 900 identifies a malfunctioning light source based on the drive current If0 and the current If1.
故障光源确定处理包括步骤S210、S220、S230、S240、S250、S260、S270和S280。后面会详细说明，在各个步骤S210、S220、S230、S240中，控制部900根据驱动电流If0和电流If1来确定短路故障光源。另外，后面会详细说明，在各个步骤S250、S260、S270、S280中，控制部900根据驱动电流If0和电流If1来确定开路故障光源。The faulty light source determination process includes steps S210, S220, S230, S240, S250, S260, S270 and S280. As will be described in detail later, in each step S210 , S220 , S230 , and S240 , the control unit 900 determines the short-circuit faulty light source according to the driving current If0 and the current If1 . In addition, as will be described in detail later, in each step S250 , S260 , S270 , and S280 , the control unit 900 determines an open fault light source according to the driving current If0 and the current If1 .
如果在上述的步骤S142中为是，则处理转入步骤S210。If YES in step S142 described above, the process proceeds to step S210.
在步骤S210中，对于DD0、DD1来说，因为DD0＝DD1的关系成立，因此与上述的前提B1的处理相同，控制部900判定为光源11-1发生了短路故障。即，控制部900判定出短路故障光源是光源11-1。然后，处理转入步骤S300。In step S210, since the relationship of DD0=DD1 holds for DD0 and DD1, the control unit 900 determines that the light source 11-1 has a short-circuit failure, similarly to the processing of the above-mentioned premise B1. That is, the control unit 900 determines that the short-circuit faulty light source is the light source 11-1. Then, the process goes to step S300.
在步骤S300中，进行驱动电流控制处理。驱动电流控制处理是用于控制部900在存在故障光源的状况下进行驱动电流的优化(控制)的处理。In step S300, drive current control processing is performed. The drive current control process is a process for the control unit 900 to optimize (control) the drive current in the presence of a faulty light source.
驱动电流控制处理包括步骤S310、S320、S330、S340、S350、S360、S370、S380。在上述的步骤S210的处理之后，处理转入步骤S310。The drive current control process includes steps S310, S320, S330, S340, S350, S360, S370, and S380. After the processing of step S210 described above, the processing proceeds to step S310.
在步骤S310中，进行处理C1。在处理C1中，控制部900进行上述的电流判定处理。在电流判定处理中，如上所述那样判定上述的式7的关系是否成立。在式7的关系成立的情况下，该处理C1结束，处理转入步骤S400。In step S310, process C1 is performed. In the process C1, the control unit 900 performs the above-mentioned current determination process. In the current determination process, it is determined whether or not the relationship of the above-mentioned Expression 7 is established as described above. When the relationship of Expression 7 holds, this process C1 ends, and the process proceeds to step S400.
另一方面，在式7的关系不成立的情况下，进行上述的驱动电流变更处理。在驱动电流变更处理中，控制部900以使得电流提供部100进行用于使向1个以上的正常光源提供的电流的电流值成为该正常光源的额定值以下的处理的方式对该电流提供部100进行控制。具体地说，在驱动电流变更处理中，控制部900控制电流提供部100变更驱动电流If0的值以使式7的关系成立。On the other hand, when the relationship of Expression 7 does not hold, the above-mentioned drive current changing process is performed. In the drive current change process, the control unit 900 controls the current supply unit 100 to perform processing for making the current value of the current supplied to one or more normal light sources equal to or less than the rated value of the normal light source. 100 for control. Specifically, in the drive current changing process, the control unit 900 controls the current supply unit 100 to change the value of the drive current If0 so that the relationship of Expression 7 holds.
在此，对伴随有上述的前提D1的以下的前提E1中的驱动电流变更处理进行说明。在前提E1中，光源11-1发生短路故障。另外，在前提E1中，假设开关14-1断开。另外，在前提E1中，驱动电流If0的电流值是15(A)。即，在前提E1的情况下，根据15÷3＝5，预定向各个作为正常光源的光源11-2～11-4提供比额定值(4.5)大的5(A)的电流。Here, the drive current changing process in the following premise E1 accompanied by the above-mentioned premise D1 will be described. In the premise E1, the light source 11-1 has a short-circuit fault. In addition, in the premise E1, it is assumed that the switch 14-1 is turned off. In addition, in the premise E1, the current value of the drive current If0 is 15 (A). That is, in the case of the premise E1, according to 15÷3=5, a current of 5 (A) larger than the rated value (4.5) is scheduled to be supplied to each of the light sources 11-2 to 11-4 which are normal light sources.
在上述前提E1中的驱动电流变更处理中，与上述前提B3中的驱动电流变更处理同样地，控制部900控制电流提供部100，将设定电流值15(A)变更成13(A)。换言之，电流提供部100按照来自控制部900的控制，将设定电流值15(A)变更成13(A)，以使式7的关系成立。即，电流提供部100进行用于使向各个作为正常光源的光源11-2～11-4提供的电流的电流值成为该正常光源的额定值(4.5)以下的处理。In the drive current change process in the above-mentioned premise E1, the control unit 900 controls the current supply unit 100 to change the set current value 15(A) to 13(A) similarly to the drive current change process in the above-mentioned premise B3. In other words, the current supply unit 100 changes the set current value 15(A) to 13(A) according to the control from the control unit 900 so that the relationship of Expression 7 holds. That is, the current supply unit 100 performs processing for making the current value of the current supplied to each of the normal light sources 11-2 to 11-4 equal to or less than the rated value (4.5) of the normal light source.
由此，电流提供部100在假设开关14-1断开的情况下，向光源11-2～11-4全体提供13(A)的驱动电流If0。此外，因为13÷3＝4.33，因此式7的关系成立。因此，在假设开关14-1断开的情况下，预定向各个作为正常光源的光源11-2～11-4提供该正常光源的额定值(4.5)以下的4.33(A)的电流。Accordingly, the current supply unit 100 supplies the driving current If0 of 13 (A) to all the light sources 11-2 to 11-4, assuming that the switch 14-1 is turned off. In addition, since 13÷3=4.33, the relationship of Expression 7 holds. Therefore, when the switch 14-1 is assumed to be off, a current of 4.33 (A) which is less than the rated value (4.5) of the normal light source is scheduled to be supplied to each of the light sources 11-2 to 11-4 which are normal light sources.
根据以上所述，在存在故障光源的状况下进行的处理C1中，控制部900在式7的关系不成立的情况下控制电流提供部100，在式7的关系成立的情况下不控制电流提供部100。As described above, in the process C1 performed when there is a faulty light source, the control unit 900 controls the current supply unit 100 when the relationship of Expression 7 does not hold, and does not control the current supply unit when the relationship of Expression 7 holds. 100.
在步骤S400中进行上述的开关控制处理。在开关控制处理中，在存在短路故障光源的情况下，控制部900控制(经由)开关控制电路15，以开关部140使向短路故障光源的电流提供停止的方式对该开关部140进行控制。In step S400, the switch control process described above is performed. In the switch control process, when there is a short-circuit fault light source, the control unit 900 controls (via) the switch control circuit 15 to control the switch unit 140 so that the current supply to the short-circuit fault light source is stopped.
开关控制处理包括步骤S410、S420、S430、S440、S450、S460、S470、S480。后面会详细说明，在各个步骤S410、S420、S430、S440中，控制部900控制(经由)开关控制电路15，以开关部140使向短路故障光源的电流提供停止的方式对该开关部140进行控制。The switch control process includes steps S410, S420, S430, S440, S450, S460, S470, S480. As will be described in detail later, in each of steps S410, S420, S430, and S440, the control unit 900 controls (via) the switch control circuit 15, and performs an operation on the switch unit 140 in such a manner that the switch unit 140 stops the supply of current to the short-circuit faulty light source. control.
在上述的步骤S310的处理之后，处理转入步骤S410。After the processing of step S310 described above, the processing proceeds to step S410.
在步骤S410中，进行处理S1。在处理S1中，进行与上述的前提B1中的开关控制处理相同的处理。首先，控制部900控制开关控制电路15，以开关部140的开关14-1使向作为短路故障光源的光源11-1的电流的提供停止的方式对该开关部140进行控制。具体地说，控制部900控制开关控制电路15-1，以开关部140的开关14-1使向作为短路故障光源的光源11-1的电流的提供停止的方式断开该开关14-1。In step S410, process S1 is performed. In the process S1, the same process as the switch control process in the above-mentioned premise B1 is performed. First, the control unit 900 controls the switch control circuit 15 to control the switch unit 140 so that the switch 14-1 of the switch unit 140 stops supply of current to the light source 11-1, which is a short-circuit failure light source. Specifically, the control unit 900 controls the switch control circuit 15-1 to turn off the switch 14-1 of the switch unit 140 so that the supply of current to the light source 11-1, which is a short-circuit failure light source, is stopped.
更具体地说，控制部900经由信号线40对开关控制电路15-1进行控制，使得设置于光源11-1的电流路径上的开关14-1的控制信号S1的电平从“H”变成“L”。由此，例如，在进行上述前提E1中的驱动电流变更处理的情况下，将13(A)的驱动电流If0均等地一分为三而得到的4.33(A)的电流均等地向各个作为正常光源的光源11-2～11-4提供。由此，光源11-2～11-4点亮。More specifically, the control unit 900 controls the switch control circuit 15-1 via the signal line 40 so that the level of the control signal S1 of the switch 14-1 provided on the current path of the light source 11-1 changes from "H" to "H". into "L". Thus, for example, in the case of performing the drive current changing process in the above-mentioned premise E1, the current of 4.33 (A) obtained by equally dividing the drive current If0 of 13 (A) into three is equally distributed to each of the normal Light sources 11-2 to 11-4 of light sources are provided. Thereby, the light sources 11-2 to 11-4 are turned on.
由此，向短路故障光源的电流提供停止，并且电流提供部100向作为正常光源的光源11-2～11-4进行电流的持续提供。即，在存在短路故障光源的情况下，通过执行步骤S310、S410，控制部900执行下面的处理N1。As a result, the current supply to the short-circuit faulty light source is stopped, and the current supply unit 100 continues to supply current to the light sources 11-2 to 11-4 which are normal light sources. That is, when there is a short-circuit failure light source, the control unit 900 executes the following process N1 by executing steps S310 and S410.
在处理N1中，在上述的式7的关系不成立的情况下，控制部900对电流提供部100和开关部140进行如上所述那样的控制，使得向正常光源进行电流的持续提供。另一方面，在该处理N1中，在上述的式7的关系成立的情况下，控制部900对开关部140进行如上所述那样的控制，使得向正常光源进行电流的持续提供。即，控制部900在存在故障光源(短路故障光源)的情况下，对电流提供部100和开关部140中的至少一方进行控制，使得向正常光源进行电流的持续提供。In process N1, when the above-mentioned relationship of Expression 7 does not hold, the control unit 900 controls the current supply unit 100 and the switch unit 140 as described above so that the current is continuously supplied to the normal light source. On the other hand, in this process N1, when the above-mentioned relationship of Expression 7 holds, the control unit 900 controls the switch unit 140 as described above so that the current is continuously supplied to the normal light source. That is, the control unit 900 controls at least one of the current supply unit 100 and the switch unit 140 to continue supplying current to the normal light source when there is a faulty light source (short-circuit faulty light source).
由此，开关部140使向短路故障光源的电流提供停止，并且电流提供部100向正常光源进行电流的持续提供。As a result, the switch unit 140 stops the current supply to the short-circuit faulty light source, and the current supply unit 100 continues to supply the current to the normal light source.
根据以上所述，光源部110(光源11-2、11-3、11-4)被上述的影像显示装置作为用于显示影像的光源使用。As described above, the light source unit 110 (light sources 11-2, 11-3, 11-4) is used as a light source for displaying images by the above-mentioned video display device.
在步骤S410的处理之后，执行步骤S500。在步骤S500中，进行信息显示处理。在信息显示处理中，控制部900对上述的影像显示装置进行使显示发生故障的光源11的信息(下面也称为“故障光源信息”)的控制。After the processing of step S410, step S500 is executed. In step S500, information display processing is performed. In the information display process, the control unit 900 performs control to display information on the failed light source 11 (hereinafter also referred to as “failure light source information”) on the video display device described above.
由此，影像显示装置例如利用OSD(OnScreenDisplay：屏幕菜单式调节方式)的功能来显示故障光源信息。故障光源信息例如是通知哪个光源11发生了故障、并且用于督促更换发生了故障的光源11的消息等。由此，使用者能够容易地得知哪个光源11发生了故障。In this way, the image display device, for example, uses the OSD (On Screen Display: On Screen Display) function to display the faulty light source information. The failed light source information is, for example, a message notifying which light source 11 has failed and prompting replacement of the failed light source 11 . Thereby, the user can easily know which light source 11 has failed.
接着，对在上述的步骤S142中为否的情况下的处理进行说明。如上所述，如果在步骤S142中为否，则处理转入步骤S143。Next, the processing in the case of NO in the above-mentioned step S142 will be described. As described above, if NO in step S142, the process proceeds to step S143.
在步骤S143中，控制部900判定是否DD1＝0。此外，在DD1＝0的情况下，控制部900判定为光源部110的状态处于短路故障状态和开路故障状态中的任意一种。如果在步骤S143中为是，则处理转入步骤S150。另一方面，如果在步骤S143中为否，则处理转入后述的步骤S144。In step S143, the control unit 900 determines whether or not DD1=0. In addition, when DD1=0, the control unit 900 determines that the state of the light source unit 110 is either a short-circuit failure state or an open-circuit failure state. If YES in step S143, the process proceeds to step S150. On the other hand, if NO in step S143, the process proceeds to step S144 described later.
在步骤S150中，进行状态判定处理A1。状态判定处理A1是控制部900根据数字数据DD0、DD1所表示的值来判定光源部110的状态是短路故障状态和开路故障状态中的哪一种。另外，在状态判定处理A1中，控制部900进行依次断开控制处理X。依次断开控制处理X是与上述的依次断开控制处理T或者上述的依次断开控制处理K相同的处理。此外，因为依次断开控制处理T、K的详细前面已经说明，因此不重复依次断开控制处理X的详细说明。In step S150, state determination processing A1 is performed. In the state determination process A1, the control unit 900 determines whether the state of the light source unit 110 is a short-circuit fault state or an open-circuit fault state based on the values indicated by the digital data DD0 and DD1 . In addition, in the state determination process A1, the control unit 900 performs the sequential disconnection control process X. The sequential disconnection control process X is the same process as the sequential disconnection control process T or the sequential disconnection control process K described above. In addition, since the details of the sequential disconnection control processes T and K have already been described above, the detailed description of the sequential disconnection control process X will not be repeated.
在依次断开控制处理X中，与依次断开控制处理T、K相同，依次仅断开开关14-1～14-4中的任意一个，之后接通。In the sequential opening control process X, like the sequential opening control processes T and K, only any one of the switches 14-1 to 14-4 is sequentially turned off and then turned on.
控制部900在每次根据依次断开控制处理X断开各开关14时，都判定下面的式8的关系是否成立。The control unit 900 judges whether or not the relationship of the following expression 8 holds every time each switch 14 is turned off according to the sequential turn-off control process X.
DD1＝DD0/3……(式8)DD1=DD0/3...(Formula 8)
下面，将当开关14-1、14-3、14-4接通且开关14-2断开时，式8的关系成立的状态也称为“状态STx2”。另外，下面，将当开关14-1、14-2、14-4接通且开关14-3断开时，式8的关系成立的状态也称为“状态STx3”。另外，下面，将当开关14-1、14-2、14-3接通且开关14-4断开时，式8的关系成立的状态也称为“状态STx4”。Hereinafter, when the switches 14-1, 14-3, and 14-4 are on and the switch 14-2 is off, the state in which the relation of Expression 8 holds is also referred to as "state STx2". In addition, below, when the switches 14-1, 14-2, and 14-4 are turned on and the switch 14-3 is turned off, the state in which the relationship of Expression 8 holds is also referred to as "state STx3". In addition, below, when the switches 14-1, 14-2, and 14-3 are on and the switch 14-4 is off, the state in which the relation of Expression 8 holds is also referred to as "state STx4".
此外，在DD1＝0的情况下，在各个状态STx2、STx3、STx4中，设置于包含有被依次断开控制处理X断开的开关14的电流路径上的光源11-2、11-3、11-4中的任意光源是短路故障光源。例如，在状态STx2中，设置于包含有被依次断开控制处理X断开的开关14-2的电流路径上的光源11-2是短路故障光源。另外，例如，在状态STx4中，设置于包含有被依次断开控制处理X断开的开关14-4的电流路径上的光源11-4是短路故障光源。In addition, in the case of DD1=0, in each state STx2, STx3, STx4, the light sources 11-2, 11-3, 11-3, Any light source in 11-4 is a short circuit fault light source. For example, in the state STx2, the light source 11-2 provided on the current path including the switch 14-2 turned off by the sequential turn-off control process X is a short-circuit failure light source. In addition, for example, in the state STx4, the light source 11-4 provided on the current path including the switch 14-4 turned off by the sequential turn-off control process X is a short-circuit failure light source.
另外，下面，将即使在通过依次断开控制处理X依次断开开关14-1～14-4的情况下，也维持DD1＝0且式8的关系不成立的状态也称为“状态STx1”。即，状态STx1是即使依次断开开关14-1～14-4的情况下，DD0、DD1的值也不变化的状态。Hereinafter, even when the switches 14-1 to 14-4 are sequentially turned off by the sequential turn-off control process X, the state in which DD1=0 is maintained and the relationship of Expression 8 does not hold is also referred to as "state STx1". That is, the state STx1 is a state in which the values of DD0 and DD1 do not change even when the switches 14-1 to 14-4 are sequentially turned off.
在状态判定处理A1中，当通过依次断开控制处理X断开开关14-1～14-4中的任意一个时，发生上述的状态STx2、STx3、STx4、STx1中的任意一种。In the state determination process A1, when any one of the switches 14-1 to 14-4 is turned off by the sequential turn-off control process X, any one of the states STx2, STx3, STx4, and STx1 described above occurs.
在状态判定处理A1中发生了状态STx2的情况下，开关14-2被断开，处理转入包含于故障光源确定处理(S200)中的步骤S220。在此，作为一例，假设驱动电流If0的电流值是12(A)，DD0＝120。在这种情况下，在状态STx2中，If1、If2、If3、If4的电流值分别是4、0、4、4。另外，DD0、DD1分别是120、40。When the state STx2 has occurred in the state determination process A1, the switch 14-2 is turned off, and the process proceeds to step S220 included in the failure light source identification process (S200). Here, as an example, it is assumed that the current value of the driving current If0 is 12 (A), and DD0=120. In this case, in the state STx2, the current values of If1, If2, If3, If4 are 4, 0, 4, 4, respectively. In addition, DD0 and DD1 are 120 and 40, respectively.
在步骤S220中，因为在状态STx2中DD1＝40且式8的关系成立，因此控制部900判定为光源11-2发生短路故障。即，控制部900判定出短路故障光源是光源11-2。另外，控制部900判定出光源部110的状态是短路故障状态。然后，处理转入包含于驱动电流控制处理(S300)的步骤S320。In step S220 , since DD1 = 40 and the relationship of Expression 8 holds true in state STx2 , the control unit 900 determines that the light source 11 - 2 has a short-circuit failure. That is, the control unit 900 determines that the short-circuit faulty light source is the light source 11-2. In addition, the control unit 900 determines that the state of the light source unit 110 is a short-circuit failure state. Then, the process proceeds to step S320 included in the drive current control process (S300).
在步骤S320中，进行处理C2。因为处理C2与上述的处理C1相同，因此不重复详细的说明。然后，处理转入包含于开关控制处理(S400)的步骤S420。In step S320, process C2 is performed. Since the process C2 is the same as the above-mentioned process C1, detailed description will not be repeated. Then, the process proceeds to step S420 included in the switch control process (S400).
在步骤S420中，进行处理S2。在处理S2中，控制部900控制(经由)开关控制电路15而对开关部140进行控制，使得开关14-2维持为断开。在这种情况下，光源11-1、11-3、11-4点亮，该光源11-1、11-3、11-4被上述的影像显示装置作为用于显示影像的光源使用。然后，在步骤S420的处理之后，执行上述的步骤S500。In step S420, process S2 is performed. In process S2, the control part 900 controls (via) the switch control circuit 15, and controls the switch part 140 so that the switch 14-2 is kept OFF. In this case, the light sources 11-1, 11-3, and 11-4 are turned on, and the light sources 11-1, 11-3, and 11-4 are used as light sources for displaying images by the video display device described above. Then, after the processing of step S420, the above-mentioned step S500 is executed.
另外，在状态判定处理A1中发生了上述的状态STx3的情况下，开关14-3被断开，处理转入包含于故障光源确定处理(S200)中的步骤S230。状态判定处理A1中的状态STx3与上述的状态STb4相同。因此，在状态STx3中，DD0、DD1分别是120、40。In addition, when the above-mentioned state STx3 occurs in the state determination process A1, the switch 14-3 is turned off, and the process proceeds to step S230 included in the failure light source identification process (S200). The state STx3 in the state determination process A1 is the same as the state STb4 described above. Therefore, in state STx3, DD0, DD1 are 120, 40, respectively.
在步骤S230中，因为在状态STx3中DD1＝40且式8的关系成立，因此控制部900判定为光源11-3发生短路故障。即，控制部900判定出短路故障光源是光源11-3。另外，控制部900判定出光源部110的状态是短路故障状态。然后，处理转入包含于驱动电流控制处理(S300)的步骤S330。In step S230 , since DD1 = 40 and the relationship of Expression 8 holds true in state STx3 , the control unit 900 determines that a short-circuit failure has occurred in the light source 11 - 3 . That is, the control unit 900 determines that the short-circuit faulty light source is the light source 11-3. In addition, the control unit 900 determines that the state of the light source unit 110 is a short-circuit failure state. Then, the process proceeds to step S330 included in the drive current control process (S300).
在步骤S330中，进行处理C3。因为处理C3与上述的处理C1相同，因此不重复详细的说明。然后，处理转入包含于开关控制处理(S400)的步骤S430。In step S330, process C3 is performed. Since the process C3 is the same as the above-mentioned process C1, detailed description will not be repeated. Then, the process proceeds to step S430 included in the switch control process (S400).
在步骤S430中，进行处理S3。在处理S3中，控制部900控制(经由)开关控制电路15而对开关部140进行控制使得开关14-3维持为断开。在这种情况下，光源11-1、11-2、11-4点亮，该光源11-1、11-2、11-4被上述的影像显示装置作为用于显示影像的光源使用。然后，在步骤S430的处理之后，执行上述的步骤S500。In step S430, process S3 is performed. In the process S3, the control part 900 controls (via) the switch control circuit 15, and controls the switch part 140 so that the switch 14-3 is kept OFF. In this case, the light sources 11-1, 11-2, and 11-4 are turned on, and the light sources 11-1, 11-2, and 11-4 are used as light sources for displaying images by the video display device described above. Then, after the processing of step S430, the above-mentioned step S500 is executed.
另外，在状态判定处理A1中发生了上述的状态STx4时，在开关14-4被断开的状态下，处理转入包含于故障光源确定处理(S200)中的步骤S240。In addition, when the above-mentioned state STx4 occurs in the state determination process A1, the process proceeds to step S240 included in the failure light source identification process (S200) with the switch 14-4 turned off.
在步骤S240中，因为在状态STx4中DD1＝40且式8的关系成立，因此控制部900判定为光源11-4发生短路故障。即，控制部900判定出短路故障光源是光源11-4。另外，控制部900判定出光源部110的状态是短路故障状态。然后，处理转入包含于驱动电流控制处理(S300)的步骤S340。In step S240, since DD1=40 and the relationship of Expression 8 holds true in state STx4, the control unit 900 determines that the light source 11-4 is short-circuited. That is, the control unit 900 determines that the short-circuit faulty light source is the light source 11-4. In addition, the control unit 900 determines that the state of the light source unit 110 is a short-circuit failure state. Then, the process proceeds to step S340 included in the drive current control process (S300).
在步骤S340中，进行处理C4。因为处理C4与上述的处理C1相同，因此不重复详细的说明。然后，处理转入包含于开关控制处理(S400)的步骤S440。In step S340, process C4 is performed. Since the process C4 is the same as the above-mentioned process C1, detailed description will not be repeated. Then, the process proceeds to step S440 included in the switch control process (S400).
在步骤S440中，进行处理S4。在处理S4中，控制部900控制(经由)开关控制电路15而对开关部140进行控制使得开关14-4维持为断开。在这种情况下，光源11-1、11-2、11-3点亮，该光源11-1、11-2、11-3被上述的影像显示装置作为用于显示影像的光源使用。然后，在步骤S440的处理之后，执行上述的步骤S500。In step S440, process S4 is performed. In process S4, the control unit 900 controls (via) the switch control circuit 15 to control the switch unit 140 so that the switch 14-4 is kept off. In this case, the light sources 11-1, 11-2, and 11-3 are turned on, and the light sources 11-1, 11-2, and 11-3 are used as light sources for displaying images by the video display device described above. Then, after the processing of step S440, the above-mentioned step S500 is executed.
另外，在状态判定处理A1发生了上述的状态STx1的情况下，处理转入包含于故障光源确定处理(S200)中的步骤S250。在状态STx1中，即使在如上所述依次断开开关14-1～14-4的情况下，也维持DD1＝0且式8的关系不成立。即，状态STx1是即使依次断开开关14-1～14-4的情况下，DD0、DD1的值也不变化的状态。此外，在状态STx1中，存在开路故障光源，该开路故障光源是光源11-1。In addition, when the above-mentioned state STx1 occurs in the state determination process A1, the process proceeds to step S250 included in the failure light source identification process (S200). In state STx1 , even when switches 14 - 1 to 14 - 4 are turned off sequentially as described above, DD1 = 0 is maintained and the relationship of Expression 8 does not hold. That is, the state STx1 is a state in which the values of DD0 and DD1 do not change even when the switches 14-1 to 14-4 are sequentially turned off. Furthermore, in the state STx1, there is an open fault light source, which is the light source 11-1.
在步骤S250中，因为即使在依次断开开关14-1～14-4的情况下，也维持DD1＝0、式8的关系不成立，因此控制部900与上述的依次断开控制处理K中的判定相同，判定出光源11-1发生开路故障。即，控制部900判定出开路故障光源是光源11-1。另外，控制部900判定光源部110的状态是开路故障状态。然后，处理转入包含于驱动电流控制处理(S300)的步骤S350。In step S250, even when the switches 14-1 to 14-4 are turned off sequentially, the relationship of DD1=0 and Expression 8 is not established, so the control unit 900 and the above-mentioned sequential turn-off control process K The determination is the same, and it is determined that an open-circuit failure has occurred in the light source 11-1. That is, the control unit 900 determines that the open fault light source is the light source 11-1. In addition, the control unit 900 determines that the state of the light source unit 110 is an open failure state. Then, the process proceeds to step S350 included in the drive current control process (S300).
在步骤S350中，进行处理C5。因为处理C5与上述的处理C1相同，因此不重复详细的说明。下面进行简单地说明。在处理C5中，在式7的关系成立的情况下，该处理C5结束，处理转入包含于开关控制处理(S400)中的步骤S450。In step S350, processing C5 is performed. Since the process C5 is the same as the above-mentioned process C1, detailed description will not be repeated. A brief description will be given below. In process C5, when the relation of Expression 7 holds, this process C5 ends, and the process proceeds to step S450 included in the switch control process (S400).
另一方面，在处理C5中，在式7的关系不成立的情况下，进行上述的驱动电流变更处理。在驱动电流变更处理中，控制部900以使得电流提供部100进行用于使向1个以上的正常光源提供的电流的电流值成为该正常光源的额定值以下的处理的方式对该电流提供部100进行控制。具体地说，在驱动电流变更处理中，控制部900控制电流提供部100，变更驱动电流If0的值，以使式7的关系成立。例如，电流提供部100进行用于使向各个作为正常光源的光源11-2～11-4提供的电流的电流值成为该正常光源的额定值(4.5)以下的处理。然后，处理转入包含于开关控制处理(S400)的步骤S450。On the other hand, in the process C5, when the relationship of Expression 7 does not hold, the above-mentioned drive current changing process is performed. In the drive current change process, the control unit 900 controls the current supply unit 100 to perform processing for making the current value of the current supplied to one or more normal light sources equal to or less than the rated value of the normal light source. 100 for control. Specifically, in the drive current change process, the control unit 900 controls the current supply unit 100 to change the value of the drive current If0 so that the relationship of Expression 7 holds. For example, the current supply unit 100 performs processing for making the current value of the current supplied to each of the normal light sources 11-2 to 11-4 equal to or less than the rated value (4.5) of the normal light source. Then, the process proceeds to step S450 included in the switch control process (S400).
根据以上所述，在存在故障光源的状况下进行的处理C5中，控制部900在式7的关系不成立的情况下控制电流提供部100，在式7的关系成立的情况下不控制电流提供部100。As described above, in the process C5 performed when there is a faulty light source, the control unit 900 controls the current supply unit 100 when the relationship of Expression 7 is not established, and does not control the current supply unit when the relationship of Expression 7 is established. 100.
在步骤S450中，进行处理S5。处理S5是与上述的处理S1相同的处理。即，在处理S5中，控制部900控制(经由)开关控制电路15对开关部140进行控制使得开关14-1断开。在这种情况下，光源11-2、11-3、11-4点亮，该光源11-2、11-3、11-4被上述的影像显示装置作为用于显示影像的光源使用。然后，在步骤S450的处理之后，执行上述的步骤S500。In step S450, process S5 is performed. Processing S5 is the same processing as above-mentioned processing S1. That is, in the process S5, the control unit 900 controls (via) the switch control circuit 15 to control the switch unit 140 so that the switch 14-1 is turned off. In this case, the light sources 11-2, 11-3, and 11-4 are turned on, and the light sources 11-2, 11-3, and 11-4 are used by the above-mentioned image display device as light sources for displaying images. Then, after the processing of step S450, the above-mentioned step S500 is executed.
此外，在存在开路故障光源的情况下，通过执行步骤S350、S450，控制部900执行下面的处理N2。在处理N2中，在上述的式7的关系不成立的情况下，控制部900对电流提供部100和开关部140进行如上所述那样的控制，使得向正常光源进行电流的持续提供。另一方面，在该处理N2中，在上述的式7的关系成立的情况下，控制部900对开关部140进行如上所述那样的控制，使得向正常光源进行电流的持续提供。即，控制部900在存在故障光源(开路故障光源)的情况下，对电流提供部100和开关部140中的至少一方进行控制，使得向正常光源进行电流的持续提供。In addition, when there is an open fault light source, by executing steps S350 and S450, the control unit 900 executes the following process N2. In process N2, when the above-mentioned relationship of Expression 7 does not hold, the control unit 900 controls the current supply unit 100 and the switch unit 140 as described above so that the current is continuously supplied to the normal light source. On the other hand, in this process N2, when the above-mentioned relationship of Expression 7 holds, the control unit 900 controls the switch unit 140 as described above so that the current is continuously supplied to the normal light source. That is, the control unit 900 controls at least one of the current supply unit 100 and the switch unit 140 to continue supplying current to the normal light source when there is a faulty light source (open circuit faulty light source).
接着，对在上述的步骤S143中为否的情况下的处理进行说明。如上所述，如果在步骤S143中为否，则处理转入步骤S144。Next, the processing in the case of NO in the above-mentioned step S143 will be described. As described above, if NO in step S143, the process proceeds to step S144.
在步骤S144中，控制部900判定为式8的关系成立。然后，处理转移到步骤S160。In step S144, the control unit 900 determines that the relationship of Expression 8 holds. Then, the process shifts to step S160.
下面，也将DD1不是0且式8的关系成立的状态称为“状态K1”。在状态K1中，If1不是0(A)。此外，在当光源部110驱动时发生状态K1的情况下，光源部110的状态是开路故障状态(即存在开路故障光源)。另外，在状态K1中，在当依次仅断开与各光源11对应的开关14时维持式8的关系的情况下，该光源11是开路故障光源。Hereinafter, the state where DD1 is not 0 and the relationship of Expression 8 holds is also referred to as "state K1". In state K1, If1 is not 0 (A). Furthermore, in the case where the state K1 occurs when the light source section 110 is driven, the state of the light source section 110 is an open failure state (ie, there is an open failure light source). In addition, in the state K1, when the relationship of Expression 8 is maintained when only the switches 14 corresponding to the respective light sources 11 are sequentially turned off, the light sources 11 are open failure light sources.
在步骤S160中，进行状态判定处理A2。在状态判定处理A2中，控制部900根据数字数据DD0、DD1所示出的值来判定光源部110的状态。状态判定处理A2在状态K1中进行。如上所述，在当光源部110驱动时发生了状态K1的情况下，光源部110的状态是开路故障状态(即存在开路故障光源)。In step S160, state determination processing A2 is performed. In the state determination process A2, the control unit 900 determines the state of the light source unit 110 based on the values indicated by the digital data DD0 and DD1. The state determination process A2 is performed in the state K1. As described above, in the case where the state K1 occurs when the light source unit 110 is driven, the state of the light source unit 110 is an open failure state (ie, there is an open failure light source).
因此，在状态判定处理A2中，控制部900判定出光源部110的状态是开路故障状态。另外，在状态判定处理A2中，控制部900进行依次断开控制处理Z。依次断开控制处理Z是与上述的依次断开控制处理K相同的处理。此外，因为依次断开控制处理K的详细前面已经说明，因此不重复依次断开控制处理Z的详细的说明。Therefore, in the state determination process A2, the control unit 900 determines that the state of the light source unit 110 is an open failure state. In addition, in the state determination process A2, the control unit 900 performs the sequential disconnection control process Z. The sequential disconnection control process Z is the same process as the sequential disconnection control process K described above. In addition, since the details of the sequential disconnection control process K have already been described above, the detailed description of the sequential disconnection control process Z will not be repeated.
在依次断开控制处理Z中，与依次断开控制处理K相同，依次仅断开开关14-1～14-4中的任意一个，之后接通。在状态判定处理A2中，当通过依次断开控制处理Z而断开了开关14-1～14-4中的任意一个时，发生上述的状态STx2、STx3、STx4中的任意一种。In the sequential opening control process Z, like the sequential opening control process K, only any one of the switches 14-1 to 14-4 is sequentially turned off and then turned on. In the state determination process A2, when any one of the switches 14-1 to 14-4 is turned off by the sequential off control process Z, any one of the states STx2, STx3, and STx4 described above occurs.
此外，在各个状态STx2、STx3、STx4中，在当通过依次断开控制处理Z而断开开关14时DD1不是0且式8的关系成立的情况下，设置于包含有该开关14的电流路径上的光源11-2、11-3、11-4中的任意一个是开路故障光源。例如，在状态STx2中，设置于包含有通过依次断开控制处理Z而断开的开关14-2的电流路径上的光源11-2是开路故障光源。另外，例如，在状态STx4中，设置于包含有通过依次断开控制处理Z而断开的开关14-4的电流路径上的光源11-4是开路故障光源。In addition, in each state STx2, STx3, STx4, when DD1 is not 0 and the relationship of Expression 8 holds when the switch 14 is turned off by the sequential turn-off control process Z, the current path including the switch 14 Any one of the light sources 11-2, 11-3, and 11-4 above is an open circuit fault light source. For example, in the state STx2, the light source 11-2 provided on the current path including the switch 14-2 turned off by the sequential turn-off control process Z is an open fault light source. In addition, for example, in the state STx4, the light source 11-4 provided on the current path including the switch 14-4 turned off by the sequential turn-off control process Z is an open fault light source.
在状态判定处理A2中发生了状态STx2的情况下，开关14-2被断开，处理转入包含于故障光源确定处理(S200)中的步骤S260。When the state STx2 occurs in the state determination process A2, the switch 14-2 is turned off, and the process proceeds to step S260 included in the failure light source identification process (S200).
在步骤S260中，因为在状态STx2中DD1不是0且式8的关系成立，因此控制部900判定出光源11-2发生开路故障。即，控制部900判定出开路故障光源是光源11-2。另外，控制部900判定出光源部110的状态是开路故障状态。然后，处理转入包含于驱动电流控制处理(S300)的步骤S360。In step S260, since DD1 is not 0 in state STx2 and the relationship of Expression 8 holds, the control unit 900 determines that an open-circuit failure has occurred in the light source 11-2. That is, the control unit 900 determines that the open fault light source is the light source 11-2. In addition, the control unit 900 determines that the state of the light source unit 110 is an open failure state. Then, the process proceeds to step S360 included in the drive current control process (S300).
在步骤S360中，进行处理C6。因为处理C6与上述的处理C1相同，因此不重复详细的说明。然后，处理转入包含于开关控制处理(S400)的步骤S460。In step S360, process C6 is performed. Since the process C6 is the same as the above-mentioned process C1, detailed description will not be repeated. Then, the process proceeds to step S460 included in the switch control process (S400).
在步骤S460中，进行处理S6。在处理S6中，控制部900控制(经由)开关控制电路15而对开关部140进行控制使得开关14-2维持为断开。在这种情况下，光源11-1、11-3、11-4点亮，该光源11-1、11-3、11-4被上述的影像显示装置作为用于显示影像的光源使用。然后，在步骤S460的处理之后，执行上述的步骤S500。In step S460, process S6 is performed. In the process S6, the control part 900 controls (via) the switch control circuit 15, and controls the switch part 140 so that the switch 14-2 is kept OFF. In this case, the light sources 11-1, 11-3, and 11-4 are turned on, and the light sources 11-1, 11-3, and 11-4 are used as light sources for displaying images by the video display device described above. Then, after the processing of step S460, the above-mentioned step S500 is executed.
另外，在状态判定处理A2中发生了上述的状态STx3时，在开关14-3被断开的状态下，处理转入包含于故障光源确定处理(S200)中的步骤S270。In addition, when the above-mentioned state STx3 occurs in the state determination process A2, the process proceeds to step S270 included in the failure light source identification process (S200) with the switch 14-3 turned off.
在步骤S270中，因为在状态STx3中DD1不是0且式8的关系成立，因此控制部900判定出光源11-3发生开路故障。即，控制部900判定出开路故障光源是光源11-3。另外，控制部900判定出光源部110的状态是开路故障状态。然后，处理转入包含于驱动电流控制处理(S300)的步骤S370。In step S270, since DD1 is not 0 and the relationship of Expression 8 holds in state STx3, the control unit 900 determines that an open-circuit failure has occurred in the light source 11-3. That is, the control unit 900 determines that the open fault light source is the light source 11-3. In addition, the control unit 900 determines that the state of the light source unit 110 is an open failure state. Then, the process proceeds to step S370 included in the drive current control process (S300).
在步骤S370中，进行处理C7。因为处理C7与上述的处理C1相同，因此不重复详细的说明。然后，处理转入包含于开关控制处理(S400)的步骤S470。In step S370, processing C7 is performed. Since the process C7 is the same as the above-mentioned process C1, detailed description will not be repeated. Then, the process proceeds to step S470 included in the switch control process (S400).
在步骤S470中，进行处理S7。在处理S7中，控制部900控制(经由)开关控制电路15而对开关部140进行控制使得开关14-3维持为断开。在这种情况下，光源11-1、11-2、11-4点亮，该光源11-1、11-2、11-4被上述的影像显示装置作为用于显示影像的光源使用。然后，在步骤S470的处理之后，执行上述的步骤S500。In step S470, process S7 is performed. In the process S7, the control part 900 controls (via) the switch control circuit 15, and controls the switch part 140 so that the switch 14-3 is kept OFF. In this case, the light sources 11-1, 11-2, and 11-4 are turned on, and the light sources 11-1, 11-2, and 11-4 are used as light sources for displaying images by the video display device described above. Then, after the processing of step S470, the above-mentioned step S500 is executed.
另外，在状态判定处理A2中发生了上述的状态STx4时，在开关14-4被断开的状态下，处理转入包含于故障光源确定处理(S200)中的步骤S280。状态判定处理A2中的状态STx4与上述的状态STc2相同。因此，在状态STx4中，DD0、DD1分别是120、40。In addition, when the above-mentioned state STx4 occurs in the state determination process A2, the process proceeds to step S280 included in the failure light source identification process (S200) with the switch 14-4 turned off. The state STx4 in the state determination process A2 is the same as the state STc2 described above. Therefore, in state STx4, DD0, DD1 are 120, 40, respectively.
在步骤S280中，因为在状态STx4中DD1不是0且式8的关系成立，因此控制部900判定出光源11-4发生开路故障。即，控制部900判定出开路故障光源是光源11-4。另外，控制部900判定出光源部110的状态是开路故障状态。然后，处理转入包含于驱动电流控制处理(S300)的步骤S380。In step S280, since DD1 is not 0 and the relationship of Expression 8 holds in state STx4, the control unit 900 determines that an open-circuit failure has occurred in the light source 11-4. That is, the control unit 900 determines that the open fault light source is the light source 11-4. In addition, the control unit 900 determines that the state of the light source unit 110 is an open failure state. Then, the process proceeds to step S380 included in the drive current control process (S300).
在步骤S380中，进行处理C8。因为处理C8与上述的处理C1相同，因此不重复详细的说明。然后，处理转入包含于开关控制处理(S400)的步骤S480。In step S380, process C8 is performed. Since the process C8 is the same as the above-mentioned process C1, detailed description will not be repeated. Then, the process proceeds to step S480 included in the switch control process (S400).
在步骤S480中，进行处理S8。在处理S8中，控制部900控制(经由)开关控制电路15而对开关部140进行控制使得开关14-4维持为断开。在这种情况下，光源11-1、11-2、11-3点亮，该光源11-1、11-2、11-3被上述的影像显示装置作为用于显示影像的光源使用。然后，在步骤S480的处理之后，执行上述的步骤S500。In step S480, process S8 is performed. In process S8, the control unit 900 controls (via) the switch control circuit 15 to control the switch unit 140 so that the switch 14-4 is kept off. In this case, the light sources 11-1, 11-2, and 11-3 are turned on, and the light sources 11-1, 11-2, and 11-3 are used as light sources for displaying images by the video display device described above. Then, after the processing of step S480, the above-mentioned step S500 is executed.
如以上说明的那样，根据本实施方式，控制部900判定在并联连接的光源11-1～11-m(m是3以上的自然数)中是否存在故障光源。控制部900在存在故障光源的情况下，对电流提供部100和开关部140中的至少一方进行控制，使得向作为光源11-1～11-m中的该故障光源以外的光源的正常光源进行电流的持续提供。As described above, according to the present embodiment, the control unit 900 determines whether or not there is a faulty light source among the parallel-connected light sources 11-1 to 11-m (m is a natural number equal to or greater than 3). When there is a faulty light source, the control unit 900 controls at least one of the current supply unit 100 and the switch unit 140 so as to switch to a normal light source that is a light source other than the faulty light source among the light sources 11-1 to 11-m. continuous supply of current.
由此，即使并联连接的多个光源的任意光源发生了故障，也能够进行光源11的持续发光。Thereby, even if any light source of the plurality of light sources connected in parallel fails, the light source 11 can continue to emit light.
另外，根据本实施方式，在并联连接的光源11-1～11-m中，控制部900根据驱动电流If0和电流If1来判定是否存在故障光源。即，能够通过2处电流的检测来实现是否存在故障光源的判定。因此，不需要在各光源11的每条电流路径上设置电流检测部。因此，能够实现光源控制装置1000的低成本化。In addition, according to the present embodiment, among the light sources 11-1 to 11-m connected in parallel, the control unit 900 determines whether there is a faulty light source based on the driving current If0 and the current If1. That is, it is possible to determine whether or not there is a faulty light source by detecting the current at two points. Therefore, it is not necessary to provide a current detection unit for each current path of each light source 11 . Therefore, it is possible to reduce the cost of the light source control device 1000 .
另外，根据本实施方式，在存在故障光源的情况下，能够通过2个电流检测部(电流检测部130、131)、和作为进行AD转换的通道的2个转换部20来确定故障光源。此外，该电流检测部130对用于获得使用者期望的亮度的驱动电流If0进行检测。另外，该电流检测部131设置于多个光源11的电流路径中的任意1个电流路径上。即，与并联连接的光源11的数量无关，能够使用2个电流检测部来确定故障光源。因此，即使光源发生了故障之后，也能够向使用者提供能够用于显示影像的光源(光源部110)。Also, according to the present embodiment, when there is a faulty light source, the faulty light source can be identified by two current detection units (current detection units 130 and 131 ) and two conversion units 20 as channels for performing AD conversion. In addition, the current detection unit 130 detects the driving current If0 for obtaining the luminance desired by the user. In addition, the current detection unit 131 is provided on any one of the current paths of the plurality of light sources 11 . That is, regardless of the number of light sources 11 connected in parallel, it is possible to specify a faulty light source using two current detection units. Therefore, even after the light source fails, it is possible to provide the user with a light source (light source unit 110 ) that can be used to display images.
另外，根据本实施方式，与并联连接的光源11的数量无关，只要具有检测电流功能的电流检测部的数量是2个即可。因此，能够以最低限度的成本来检测光源11的故障。In addition, according to the present embodiment, it does not matter the number of light sources 11 connected in parallel, as long as the number of current detection units having a current detection function is two. Therefore, failure of the light source 11 can be detected at a minimum cost.
另外，根据本实施方式，即使在存在故障光源的情况下，也能够向该正常光源提供计算出的相对于正常光源(光源11)的额定值而言最佳的电流值的电流。因此，即使在存在故障光源的情况下，也能够提供发出最佳亮度的光的光源(光源部110)。因此，能够提供安全品质的光源控制装置1000。In addition, according to the present embodiment, even when there is a faulty light source, it is possible to supply the normal light source with a calculated current having an optimal current value with respect to the rated value of the normal light source (light source 11 ). Therefore, even when there is a faulty light source, it is possible to provide a light source (light source unit 110 ) that emits light with optimum luminance. Therefore, it is possible to provide the light source control device 1000 of safe quality.
另外，根据本实施方式，在存在故障光源的情况下，控制部900以使得电流提供部100进行用于使向1个以上的正常光源提供的电流的电流值成为该正常光源的额定值以下的处理的方式对该电流提供部100进行控制。因此，即使在光源发生了故障的情况下，也不会诱发其它的光源(正常光源)的进一步故障，能够向正常光源提供与适当的亮度对应的最适合的电流。因此，能够向使用者提供发出最适合的亮度的光的良好状态的光源(光源部110)。In addition, according to the present embodiment, when there is a faulty light source, the control unit 900 causes the current supply unit 100 to perform the operation for making the current value of the current supplied to one or more normal light sources equal to or less than the rated value of the normal light source. The manner of processing controls the current supply unit 100 . Therefore, even when a light source fails, further failure of other light sources (normal light sources) is not induced, and an optimum current corresponding to appropriate luminance can be supplied to the normal light sources. Therefore, it is possible to provide the user with a good light source (light source unit 110 ) that emits light with optimum brightness.
即，在本实施方式的光源控制装置1000中，要精度良好地对电流提供部100向光源部110提供的驱动电流If0进行控制，不能够删除检测电阻R0和电流检测部130。That is, in the light source control device 1000 of this embodiment, the detection resistor R0 and the current detection unit 130 cannot be deleted in order to accurately control the driving current If0 supplied from the current supply unit 100 to the light source unit 110 .
但是，不需要对构成光源部110的各光源11各设置1个故障检测用的电流检测部。即，在光源控制装置1000中，对各光源11中的任意1个光源11设置1个电流检测部131。由此，能够通过2个电流检测部(电流检测部130、最低需要的电流检测部)来进行光源11的故障检测。因此，与对各光源11各设置1个故障检测用电流检测部的当前的光源控制装置相比，能够削减故障检测用的电流检测部。因此，能够降低光源控制装置1000的制造成本。However, it is not necessary to provide one current detection unit for failure detection for each of the light sources 11 constituting the light source unit 110 . That is, in the light source control device 1000 , one current detection unit 131 is provided for any one of the light sources 11 . Thereby, failure detection of the light source 11 can be performed by two current detection parts (the current detection part 130, the minimum necessary current detection part). Therefore, compared with the current light source control device in which one current detection unit for failure detection is provided for each light source 11 , the number of current detection units for failure detection can be reduced. Therefore, the manufacturing cost of the light source control device 1000 can be reduced.
此外，在本实施方式中，对光源11的数量是4个的情况下的驱动电流管理处理进行了说明。但是，光源11的数量不限于4个，也可以是2个、3个或者5个以上。在本实施方式中，如果具有2个电流检测部和作为进行AD转换的通道的2个转换部20，则能够检测全部的光源11的故障。该2个电流检测部是对用于获得使用者期望的亮度的驱动电流If0进行检测的电流检测部130、和设置于多个光源11的电流路径中的任意1个电流路径上的电流检测部131。In addition, in this embodiment, the driving current management process in the case where the number of light sources 11 is four has been described. However, the number of light sources 11 is not limited to four, and may be two, three, or five or more. In this embodiment, if there are two current detection units and two conversion units 20 as channels for performing AD conversion, failures of all light sources 11 can be detected. The two current detection units are the current detection unit 130 that detects the driving current If0 for obtaining the luminance desired by the user, and the current detection unit provided on any one of the current paths of the plurality of light sources 11 . 131.
然后，在光源控制装置1000中，不会诱发故障光源以外的各正常光源的故障，并向该各正常光源提供最适当的电流，使该各正常光源点亮。由此，能够向使用者提供用于继续显示影像的光源(光源部110)。Then, in the light source control device 1000, each normal light source other than the faulty light source is not induced to fail, and an optimum current is supplied to each normal light source to turn on each normal light source. Accordingly, it is possible to provide the user with a light source (light source unit 110 ) for continuing to display images.
另外，在本实施方式中，进行上述的图4的信息显示处理。在信息显示处理中，显示上述的故障光源信息。由此，能够向使用者公开光源11的故障状态。即，能够向使用者传达发生了故障的光源11的信息。具体地说，能够向使用者通知哪个光源11发生了故障，并且督促更换发生了故障的光源11。因此，例如，能够在全部的光源11发生故障之前实现光源控制装置1000的快速恢复。In addition, in this embodiment, the information display process of FIG. 4 mentioned above is performed. In the information display processing, the above-mentioned failure light source information is displayed. Thereby, the failure state of the light source 11 can be disclosed to the user. That is, it is possible to convey the information of the malfunctioning light source 11 to the user. Specifically, it is possible to notify the user which light source 11 has failed, and to prompt replacement of the failed light source 11 . Therefore, for example, it is possible to quickly restore the light source control device 1000 before all the light sources 11 fail.
此外，在上述的信息显示处理中，影像显示装置显示故障光源信息，但并不限于此。故障光源信息也可以用对光源控制装置1000进行控制的控制用计算机、液晶显示装置等来显示。In addition, in the above information display process, the image display device displays the faulty light source information, but the present invention is not limited thereto. The failed light source information may be displayed by a control computer, a liquid crystal display device, or the like that controls the light source control device 1000 .
此外，如上所述，光源11不限于LED，例如也可以是激光器等其它的半导体光源。In addition, as mentioned above, the light source 11 is not limited to LED, For example, other semiconductor light sources, such as a laser, may be sufficient.
另外，在本实施方式中说明的电流检测部130、131、AD转换器200的规格和特性仅是一例，只要能够获得相同的效果则并不限于此。In addition, the specifications and characteristics of the current detection units 130 and 131 and the AD converter 200 described in this embodiment are merely examples, and are not limited thereto as long as the same effect can be obtained.
另外，在本实施方式中，控制部900按照规定的程序进行各开关14的控制、电流提供部100的控制等，但并不限于此。控制部900也可以构成为例如通过电路等硬件来进行各开关14的控制、电流提供部100的控制等。即使在该结构中，也能够获得与上述相同的效果。In addition, in the present embodiment, the control unit 900 performs control of the switches 14, control of the current supply unit 100, and the like in accordance with a predetermined program, but the present invention is not limited thereto. The control unit 900 may be configured, for example, to perform control of the switches 14 , control of the current supply unit 100 , and the like by hardware such as a circuit. Even in this configuration, the same effects as those described above can be obtained.
(其它的变形例)(other modifications)
以上根据实施方式对本发明的光源控制装置进行了说明，但本发明并不限于这些实施方式。本发明中也包括在在本实施方式中实施的、在不脱离本发明的主旨的范围内本领域技术人员能够想到的变形。即，本发明能够在该发明的范围内对实施方式进行适当变形、省略。The light source control device of the present invention has been described above based on the embodiments, but the present invention is not limited to these embodiments. The present invention also includes modifications that can be conceived by those skilled in the art within the range that is carried out in the present embodiment without departing from the gist of the present invention. That is, the present invention can appropriately modify and omit the embodiments within the scope of the invention.
另外，光源控制装置1000也可以不包括图1或者图2所示的全部的结构要素。即，光源控制装置1000只要包括能够实现本发明的效果的最小限度的结构要素即可。In addition, the light source control device 1000 may not include all the components shown in FIG. 1 or FIG. 2 . That is, the light source control device 1000 only needs to include the minimum structural elements capable of achieving the effects of the present invention.
另外，本发明也可以作为将光源控制装置1000所具有的特征性的结构部的工作形成为步骤的光源控制方法来实现。另外，本发明也可以作为使计算机执行包含于那样的光源控制方法中的各步骤的程序来实现。另外，本发明也可以作为保存那样的程序的计算机可读取的记录介质来实现。另外，该程序也可以经由互联网等传送介质来发布。In addition, the present invention can also be realized as a light source control method in which the operations of the characteristic components included in the light source control device 1000 are formed into steps. In addition, the present invention can also be realized as a program that causes a computer to execute each step included in such a light source control method. In addition, the present invention can also be realized as a computer-readable recording medium storing such a program. In addition, this program can also be distributed via transmission media such as the Internet.
另外，本发明的光源控制方法相当于图4的处理的一部分或者全部。本发明的光源控制方法未必需要包括图4中的对应的全部步骤。即，本发明的光源控制方法只要包括能够实现本发明的效果的最小限度的步骤即可。本发明的光源控制方法也可以仅由例如图4的步骤S140、S300、S400来构成。另外，在本发明的光源控制方法中，例如也可以不执行图4的步骤S500。In addition, the light source control method of the present invention corresponds to a part or all of the processing in FIG. 4 . The light source control method of the present invention does not necessarily need to include all the corresponding steps in FIG. 4 . That is, the light source control method of the present invention only needs to include the minimum number of steps capable of realizing the effects of the present invention. The light source control method of the present invention may only be constituted by steps S140 , S300 , and S400 in FIG. 4 , for example. In addition, in the light source control method of the present invention, for example, step S500 in FIG. 4 may not be executed.
另外，光源控制方法中的各步骤的执行顺序仅是用于具体地说明本发明的一例，也可以是上述以外的顺序。另外，也可以彼此独立而并行地执行光源控制方法中的步骤的一部分和其它的步骤。In addition, the execution order of each step in the light source control method is merely an example for specifically describing the present invention, and may be an order other than the above. In addition, part of the steps in the light source control method and other steps may be executed independently of each other and in parallel.
此外，光源控制装置1000的各结构要素的一部分也可以作为典型的集成电路的LSI(LargeScaleIntegration：大规模集成电路)来实现。例如，在光源控制装置1000中，控制部900、开关部140、电流检测部130、131以及开关控制电路15-1～15-m可以作为集成电路来实现。In addition, some of the constituent elements of the light source control device 1000 may be realized as an LSI (Large Scale Integration: Large Scale Integration) which is a typical integrated circuit. For example, in the light source control device 1000, the control unit 900, the switch unit 140, the current detection units 130 and 131, and the switch control circuits 15-1 to 15-m can be implemented as integrated circuits.
在所述实施方式中使用的所有的数量值是用于具体说明本发明的一例的数值。即，本发明不受在上述实施方式中使用的各数值限制。All numerical values used in the above-described embodiments are numerical values for concretely describing an example of the present invention. That is, the present invention is not limited by the numerical values used in the above-mentioned embodiments.
此外，本发明能够在该发明的范围内对实施方式进行适当变形、省略。In addition, the present invention can appropriately modify and omit the embodiments within the scope of the present invention.
例如，在上述的实施方式中，虽然构成为设置有1个故障检测用电流检测部(电流检测部131)，但也可以构成为设置有u(2≤u＜m)个故障检测用电流检测部(下面也称为“变形结构A”)。下面，也将故障检测用的电流检测部称为“故障应对电流检测部”。For example, in the above-mentioned embodiment, although one current detection unit for fault detection (the current detection unit 131) is provided, it may be configured such that u (2≤u<m) current detection units for fault detection are provided. part (hereinafter also referred to as "deformation structure A"). Hereinafter, the current detection unit for failure detection is also referred to as a “failure response current detection unit”.
在变形结构A中，例如在u＝2的情况下，图1的光源控制装置1000除了设置于光源11-1的电流路径上的故障应对电流检测部(电流检测部131)之外，例如还设置有设置于光源11-2的电流路径上的故障应对电流检测部(下面也称为“故障应对电流检测部A”)。在这种情况下，故障应对电流检测部A与检测电阻R1-2电气上并联连接。另外，故障应对电流检测部A对电流If2进行检测。然后，AD转换器200随时向控制部900发送检测出的与电流If2的电流值对应的数字数据DD2。In modified structure A, for example, in the case of u=2, the light source control device 1000 of FIG. A fault handling current detection section (hereinafter also referred to as "fault handling current detection section A") provided on the current path of the light source 11-2 is provided. In this case, the fault response current detection unit A is electrically connected in parallel to the detection resistor R1-2. In addition, the failure-prevention current detection unit A detects the current If2. Then, the AD converter 200 sends the digital data DD2 corresponding to the detected current value of the current If2 to the control unit 900 as needed.
即，在应用了变形结构A的光源控制装置1000中，在u＝2的情况下，该光源控制装置1000具有2个电流检测部，该2个电流检测部分别对向2个光源11提供的电流If1、If2进行检测。即，光源控制装置1000具有：故障应对电流检测部(电流检测部131)，其检测向光源11-1提供的电流If1；以及故障应对电流检测部A，其检测向光源11-2提供的电流If2。That is, in the light source control device 1000 to which the modification structure A is applied, when u=2, the light source control device 1000 has two current detection parts, and the two current detection parts respectively respond to the current supplied to the two light sources 11. Currents If1, If2 are detected. That is, the light source control device 1000 includes: a failure-prevention current detection unit (current detection unit 131) that detects the current If1 supplied to the light source 11-1; and a failure-prevention current detection unit A that detects the current supplied to the light source 11-2. If2.
即，在应用了变形结构A的光源控制装置1000中，在u＝2且在任意的光源11中发生了故障的情况下，能够相比故障应对电流检测部的数量是1个的情况缩短用于确定发生了故障的光源11所需要的时间。That is, in the light source control device 1000 to which the modified structure A is applied, when u=2 and a failure occurs in any light source 11, the number of failure-responsive current detectors can be shortened compared to the case where the number of failure-responsive current detection units is one. The time required to determine the light source 11 that has failed.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-197844 | 2014-09-29 | ||
| JP2014197844AJP2016071981A (en) | 2014-09-29 | 2014-09-29 | Light source control device and light source control method |
| Publication Number | Publication Date |
|---|---|
| CN105472837Atrue CN105472837A (en) | 2016-04-06 |
| CN105472837B CN105472837B (en) | 2018-06-29 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510623454.9AExpired - Fee RelatedCN105472837B (en) | 2014-09-29 | 2015-09-25 | Light source control device and light source control method |
| Country | Link |
|---|---|
| US (1) | US9370082B2 (en) |
| JP (1) | JP2016071981A (en) |
| CN (1) | CN105472837B (en) |
| RU (1) | RU2614037C1 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI583258B (en)* | 2015-01-30 | 2017-05-11 | 榮創能源科技股份有限公司 | Fault detection apparatus and fault detection method |
| US10388161B2 (en) | 2015-09-16 | 2019-08-20 | Truck-Lite Co., Llc | Telematics road ready system with user interface |
| US10093232B2 (en) | 2015-09-16 | 2018-10-09 | Truck-Lite Co., Llc | Telematics road ready system |
| US20180014374A1 (en) | 2016-07-08 | 2018-01-11 | Hubbell Incorporated | Horticultural light |
| US20190268675A1 (en) | 2017-03-15 | 2019-08-29 | Scott Troutman | Telematics Road Ready System including a Bridge Integrator Unit |
| CN108877673B (en)* | 2018-07-27 | 2020-12-25 | 京东方科技集团股份有限公司 | Method and device for controlling driving current of display panel, electronic equipment and storage medium |
| JP2020088020A (en)* | 2018-11-16 | 2020-06-04 | ソニーセミコンダクタソリューションズ株式会社 | Detection circuit, drive circuit, and light-emitting device |
| WO2020110504A1 (en)* | 2018-11-27 | 2020-06-04 | ソニーセミコンダクタソリューションズ株式会社 | Drive device and light-emitting device |
| US12144083B2 (en)* | 2022-12-22 | 2024-11-12 | Valeo Vision | Multi-branch light system with current balancing and failure indication |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201821553U (en)* | 2010-09-19 | 2011-05-04 | 英飞特电子（杭州）有限公司 | Open-circuit protecting circuit of light emitting diode constant-current driving circuit |
| CN102497694A (en)* | 2011-11-14 | 2012-06-13 | 哈尔滨工业大学 | Digital LED driving circuit based on the observation of the number of open circuits in the array |
| CN102510636A (en)* | 2011-11-15 | 2012-06-20 | 韦挽澜 | Current detection IC for driving white-light LED |
| CN102612861A (en)* | 2009-11-13 | 2012-07-25 | 日亚化学工业株式会社 | Light-emitting diode drive device and light-emitting diode illumination control method |
| US20130127343A1 (en)* | 2010-08-03 | 2013-05-23 | Inventronics (Hangzhou), Inc. | Power supply circuit for multi-path light-emitting diode (led) loads |
| CN103415111A (en)* | 2013-07-30 | 2013-11-27 | 浙江生辉照明有限公司 | Drive circuit and drive method of LED illuminating device |
| CN203352858U (en)* | 2012-11-09 | 2013-12-18 | 刘芬 | LED all-turning-on control circuit and constant voltage driven LED illumination system |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4236894B2 (en)* | 2002-10-08 | 2009-03-11 | 株式会社小糸製作所 | Lighting circuit |
| JP4722649B2 (en) | 2005-09-27 | 2011-07-13 | 日立アプライアンス株式会社 | LED light source device |
| JP2007096113A (en) | 2005-09-29 | 2007-04-12 | Hitachi Lighting Ltd | Led light source device |
| US8400071B2 (en)* | 2007-12-07 | 2013-03-19 | Koninklijke Philips Electronics N.V. | LED lamp power management system and method |
| US8334662B2 (en)* | 2009-09-11 | 2012-12-18 | Iwatt Inc. | Adaptive switch mode LED driver |
| JP5527108B2 (en)* | 2010-08-26 | 2014-06-18 | セイコーエプソン株式会社 | Light source control device and projector |
| JP5942314B2 (en)* | 2011-02-22 | 2016-06-29 | パナソニックＩｐマネジメント株式会社 | Lighting device and lighting apparatus using the same |
| KR101453053B1 (en)* | 2011-04-20 | 2014-10-23 | 주식회사 이엠퍼스트 | Lighting equipment using LED and control method of the same |
| TWM418292U (en)* | 2011-05-18 | 2011-12-11 | Richtek Technology Corp | Light emitting device open/short detection circuit |
| US8896214B2 (en)* | 2011-12-19 | 2014-11-25 | Monolithic Power Systems, Inc. | LED driving system for driving multi-string LEDs and the method thereof |
| US8896319B2 (en)* | 2012-02-24 | 2014-11-25 | Richtek Technology Corporation | Light emitting device control circuit and short detection circuit thereof |
| JP6066613B2 (en)* | 2012-08-08 | 2017-01-25 | 三菱電機株式会社 | Light source control device and light source control method |
| EP2739119B1 (en)* | 2012-11-30 | 2015-08-19 | Dialog Semiconductor GmbH | Short circuit detection for lighting circuits |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102612861A (en)* | 2009-11-13 | 2012-07-25 | 日亚化学工业株式会社 | Light-emitting diode drive device and light-emitting diode illumination control method |
| US20130127343A1 (en)* | 2010-08-03 | 2013-05-23 | Inventronics (Hangzhou), Inc. | Power supply circuit for multi-path light-emitting diode (led) loads |
| CN201821553U (en)* | 2010-09-19 | 2011-05-04 | 英飞特电子（杭州）有限公司 | Open-circuit protecting circuit of light emitting diode constant-current driving circuit |
| CN102497694A (en)* | 2011-11-14 | 2012-06-13 | 哈尔滨工业大学 | Digital LED driving circuit based on the observation of the number of open circuits in the array |
| CN102510636A (en)* | 2011-11-15 | 2012-06-20 | 韦挽澜 | Current detection IC for driving white-light LED |
| CN203352858U (en)* | 2012-11-09 | 2013-12-18 | 刘芬 | LED all-turning-on control circuit and constant voltage driven LED illumination system |
| CN103415111A (en)* | 2013-07-30 | 2013-11-27 | 浙江生辉照明有限公司 | Drive circuit and drive method of LED illuminating device |
| Publication number | Publication date |
|---|---|
| CN105472837B (en) | 2018-06-29 |
| JP2016071981A (en) | 2016-05-09 |
| US20160095194A1 (en) | 2016-03-31 |
| US9370082B2 (en) | 2016-06-14 |
| RU2614037C1 (en) | 2017-03-22 |
| Publication | Publication Date | Title |
|---|---|---|
| CN105472837B (en) | Light source control device and light source control method | |
| JP6234154B2 (en) | Light source control device and light source control method | |
| CN102548119B (en) | Semiconductor light source device, semiconductor light source control method, and projection apparatus | |
| JP6066613B2 (en) | Light source control device and light source control method | |
| JP2006210219A (en) | Lighting control circuit for vehicular lamp | |
| JP2007327753A (en) | Failure detection device | |
| JP2016009537A (en) | Light source control device and light source control method | |
| US10613605B2 (en) | Service device, power supply control method, program, external power supply device, and server system | |
| US11381687B2 (en) | Information processing apparatus and control method therefor | |
| JP2015020460A (en) | Control device of on-vehicle illumination lamp | |
| CN104112414A (en) | Projection Type Video Display | |
| US20200314256A1 (en) | Information processing device and control method therefor | |
| US20110128304A1 (en) | Light emitting element circuit and liquid crystal display device | |
| TWI804112B (en) | Scanning display with short-circuit detection function and its data device | |
| JP2010098209A (en) | Broken light emitting element detection system | |
| JP6352528B2 (en) | LED lighting device and LED lighting method | |
| JP2019129050A (en) | Light source device and projection type display device | |
| JP2012204176A (en) | Led light source unit checker | |
| JP6594590B2 (en) | In-vehicle lighting system | |
| JP7106966B2 (en) | vehicle lamp | |
| JP2017123241A (en) | Video display device | |
| JP6141463B2 (en) | lighting equipment | |
| JP5788242B2 (en) | LED lighting device and display device having the same | |
| WO2019163898A1 (en) | Voltage measurement device, voltage detection circuit, and voltage detection method | |
| JP2010140723A (en) | Switching system for vehicle |
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | Granted publication date:20180629 Termination date:20210925 | |
| CF01 | Termination of patent right due to non-payment of annual fee |